diff --git a/.eslintrc b/.eslintrc
index 535a1ebf..cd47acb0 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -4,6 +4,7 @@
         "ecmaVersion": 2017,
         "sourceType": "module"
     },
+    "ignorePatterns": ["**/scheme-numbers.js"],
     "rules": {
         "indent": ["error", 4],
         "import/extensions": ["error", "always"],
diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index 7ae19168..360369ee 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -11,11 +11,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [14]
+        node-version: [18]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v2
+      uses: actions/setup-node@v3
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm ci
diff --git a/.github/workflows/racket.yml b/.github/workflows/racket.yml
index 4ac8ba5e..8637b985 100644
--- a/.github/workflows/racket.yml
+++ b/.github/workflows/racket.yml
@@ -14,19 +14,32 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        racket-version: [ '6.12', '7.0', '7.4', '7.5', '7.6', '7.7', '7.8' ]
-        racket-variant: [ 'BC' ]
-        experimental: [false]
+        racket-version: [ '8.0', '8.1', '8.2', '8.3', '8.4',
+                          '8.5', '8.6', '8.7', 'current']
+        racket-variant: [ 'CS' ]
+        experimental: [true]
         include:
-          - racket-version: '8.0'
-            racket-variant: 'CS'
-            experimental: true
-          - racket-version: '8.1'
-            racket-variant: 'CS'
-            experimental: true
-          - racket-version: 'current'
-            racket-variant: 'CS'
-            experimental: true
+          - racket-version: '6.12'
+            racket-variant: 'BC'
+            experimental: false
+          - racket-version: '7.0'
+            racket-variant: 'BC'
+            experimental: false
+          - racket-version: '7.4'
+            racket-variant: 'BC'
+            experimental: false
+          - racket-version: '7.5'
+            racket-variant: 'BC'
+            experimental: false
+          - racket-version: '7.6'
+            racket-variant: 'BC'
+            experimental: false
+          - racket-version: '7.7'
+            racket-variant: 'BC'
+            experimental: false
+          - racket-version: '7.8'
+            racket-variant: 'BC'
+            experimental: false
     name: Racket ${{ matrix.racket-version }} ${{ matrix.racket-variant }}
     steps:
       - uses: actions/checkout@master
diff --git a/README.md b/README.md
index 4fc6d697..7e6bd3ab 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,10 @@
 [![Coverage Status](https://codecov.io/gh/racketscript/racketscript/coverage.svg?branch=master)](https://codecov.io/gh/racketscript/racketscript?branch=master)
 [![Try Online](https://img.shields.io/badge/try_it-online!-ff9900.svg)](http://play.racketscript.org)
 
+[![Racket](https://img.shields.io/badge/-Racket-darkred?logo=racket)](https://racket-lang.org)
+[![Discourse users](https://img.shields.io/discourse/users?label=Discuss%20on%20Racket%20Discourse&logo=racket&server=https%3A%2F%2Fracket.discourse.group)](https://racket.discourse.group/)
+[![Racket Discord](https://img.shields.io/discord/571040468092321801?label=Chat%20on%20Racket%20Discord&logo=racket)](https://discord.gg/6Zq8sH5)
+
 RacketScript is an **experimental** lightweight Racket to JavaScript (ECMAScript 6)
 compiler. RacketScript aims to leverage both JavaScript and Racket's ecosystem,
 and make interoperability between them clean and smooth.
@@ -23,6 +27,8 @@ currently supports only a subset of Racket.
 You can try RacketScript in your browser
 at [RacketScript Playground](http://play.racketscript.org).
 
+You may alo be interested in [Rackt](https://rackt-org.github.io) - An ultrasmall (~70 loc) React wrapper written in RacketScript.
+
 ## Disclaimer
 
 RacketScript is **work-in-progress** and is not mature and stable. Several
diff --git a/package-lock.json b/package-lock.json
index 71a13da0..38a9494a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,137 +5,202 @@
   "packages": {
     "": {
       "devDependencies": {
-        "eslint": "^4.19.1",
+        "eslint": "^8.36.0",
         "eslint-config-airbnb-base": "^12.0.0",
         "eslint-plugin-import": "^2.7.0"
       }
     },
-    "node_modules/acorn": {
-      "version": "5.7.4",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
-      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==",
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
+      "integrity": "sha512-1/sA4dwrzBAyeUoQ6oxahHKmrZvsnLCg4RfxW3ZFGGmQkSNQPFNLV9CUEFQP1x9EYXHTo5p6xdhZM1Ne9p/AfA==",
       "dev": true,
-      "bin": {
-        "acorn": "bin/acorn"
+      "dependencies": {
+        "eslint-visitor-keys": "^3.3.0"
       },
       "engines": {
-        "node": ">=0.4.0"
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
       }
     },
-    "node_modules/acorn-jsx": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
-      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.4.1.tgz",
+      "integrity": "sha512-BISJ6ZE4xQsuL/FmsyRaiffpq977bMlsKfGHTQrOGFErfByxIe6iZTxPf/00Zon9b9a7iUykfQwejN3s2ZW/Bw==",
       "dev": true,
-      "dependencies": {
-        "acorn": "^3.0.4"
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
       }
     },
-    "node_modules/acorn-jsx/node_modules/acorn": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-      "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+    "node_modules/@eslint/eslintrc": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-2.0.1.tgz",
+      "integrity": "sha512-eFRmABvW2E5Ho6f5fHLqgena46rOj7r7OKHYfLElqcBfGFHHpjBhivyi5+jOEQuSpdc/1phIZJlbC2te+tZNIw==",
       "dev": true,
-      "bin": {
-        "acorn": "bin/acorn"
+      "dependencies": {
+        "ajv": "^6.12.4",
+        "debug": "^4.3.2",
+        "espree": "^9.5.0",
+        "globals": "^13.19.0",
+        "ignore": "^5.2.0",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^4.1.0",
+        "minimatch": "^3.1.2",
+        "strip-json-comments": "^3.1.1"
       },
       "engines": {
-        "node": ">=0.4.0"
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/ajv": {
-      "version": "5.5.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+    "node_modules/@eslint/js": {
+      "version": "8.36.0",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-8.36.0.tgz",
+      "integrity": "sha512-lxJ9R5ygVm8ZWgYdUweoq5ownDlJ4upvoWmO4eLxBYHdMo+vZ/Rx0EN6MbKWDJOSUGrqJy2Gt+Dyv/VKml0fjg==",
+      "dev": true,
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@humanwhocodes/config-array": {
+      "version": "0.11.8",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.11.8.tgz",
+      "integrity": "sha512-UybHIJzJnR5Qc/MsD9Kr+RpO2h+/P1GhOwdiLPXK5TWk5sgTdu88bTD9UP+CKbPPh5Rni1u0GjAdYQLemG8g+g==",
       "dev": true,
       "dependencies": {
-        "co": "^4.6.0",
-        "fast-deep-equal": "^1.0.0",
-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.3.0"
+        "@humanwhocodes/object-schema": "^1.2.1",
+        "debug": "^4.1.1",
+        "minimatch": "^3.0.5"
+      },
+      "engines": {
+        "node": ">=10.10.0"
       }
     },
-    "node_modules/ajv-keywords": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
-      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
+    "node_modules/@humanwhocodes/module-importer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
+      "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
+      "dev": true,
+      "engines": {
+        "node": ">=12.22"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@humanwhocodes/object-schema": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-1.2.1.tgz",
+      "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
       "dev": true
     },
-    "node_modules/ansi-escapes": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
-      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
+    "node_modules/@nodelib/fs.scandir": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
+      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
       "dev": true,
+      "dependencies": {
+        "@nodelib/fs.stat": "2.0.5",
+        "run-parallel": "^1.1.9"
+      },
       "engines": {
-        "node": ">=4"
+        "node": ">= 8"
       }
     },
-    "node_modules/ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+    "node_modules/@nodelib/fs.stat": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
+      "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
       "dev": true,
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">= 8"
       }
     },
-    "node_modules/ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+    "node_modules/@nodelib/fs.walk": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
+      "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
       "dev": true,
+      "dependencies": {
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+        "fastq": "^1.6.0"
+      },
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">= 8"
       }
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-    "node_modules/argparse": {
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-      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
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+    "node_modules/acorn": {
+      "version": "8.8.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.8.2.tgz",
+      "integrity": "sha512-xjIYgE8HBrkpd/sJqOGNspf8uHG+NOHGOw6a/Urj8taM2EXfdNAH2oFcPeIFfsv3+kz/mJrS5VuMqbNLjCa2vw==",
       "dev": true,
-      "dependencies": {
-        "sprintf-js": "~1.0.2"
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
       }
     },
-    "node_modules/babel-code-frame": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
-      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+    "node_modules/acorn-jsx": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
+      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
       "dev": true,
-      "dependencies": {
-        "chalk": "^1.1.3",
-        "esutils": "^2.0.2",
-        "js-tokens": "^3.0.2"
+      "peerDependencies": {
+        "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
       }
     },
-    "node_modules/babel-code-frame/node_modules/chalk": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+    "node_modules/ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "dev": true,
       "dependencies": {
-        "ansi-styles": "^2.2.1",
-        "escape-string-regexp": "^1.0.2",
-        "has-ansi": "^2.0.0",
-        "strip-ansi": "^3.0.0",
-        "supports-color": "^2.0.0"
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=8"
       }
     },
-    "node_modules/babel-code-frame/node_modules/strip-ansi": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-      "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
       "dev": true,
       "dependencies": {
-        "ansi-regex": "^2.0.0"
+        "color-convert": "^2.0.1"
       },
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
+    "node_modules/argparse": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+      "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
+      "dev": true
+    },
     "node_modules/balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -152,12 +217,6 @@
         "concat-map": "0.0.1"
       }
     },
-    "node_modules/buffer-from": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
-      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
-      "dev": true
-    },
     "node_modules/builtin-modules": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
@@ -167,118 +226,47 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/caller-path": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
-      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
-      "dev": true,
-      "dependencies": {
-        "callsites": "^0.2.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/callsites": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
-      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
       "dev": true,
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=6"
       }
     },
     "node_modules/chalk": {
-      "version": "2.4.2",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-      "dev": true,
-      "dependencies": {
-        "ansi-styles": "^3.2.1",
-        "escape-string-regexp": "^1.0.5",
-        "supports-color": "^5.3.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/chalk/node_modules/ansi-styles": {
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+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
       "dev": true
     }
   }
diff --git a/package.json b/package.json
index 21c49307..1f8fc693 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "devDependencies": {
-    "eslint": "^4.19.1",
+    "eslint": "^8.36.0",
     "eslint-config-airbnb-base": "^12.0.0",
     "eslint-plugin-import": "^2.7.0"
   }
diff --git a/racketscript-compiler/info.rkt b/racketscript-compiler/info.rkt
index 4420b113..4a7c3ef9 100644
--- a/racketscript-compiler/info.rkt
+++ b/racketscript-compiler/info.rkt
@@ -8,7 +8,7 @@
     ["racket" "6.4"]
     "typed-racket-lib"
     "typed-racket-more"
-    "threading"
+    "threading-lib"
     "graph-lib"
     "anaphoric"))
 
diff --git a/racketscript-compiler/racketscript/compiler/assembler.rkt b/racketscript-compiler/racketscript/compiler/assembler.rkt
index 21e49b3f..952d497d 100644
--- a/racketscript-compiler/racketscript/compiler/assembler.rkt
+++ b/racketscript-compiler/racketscript/compiler/assembler.rkt
@@ -310,14 +310,6 @@
        [_ #:when (single-flonum? v) (emit (~a (exact->inexact (inexact->exact v))))]
        [_ (emit (~a v))])] ;; TODO
     [(boolean? v) (emit (if v "true" "false"))]
-    [(regexp? v)
-     (define s (string-replace (cast (object-name v) String) "/" "\\/"))
-     (write (format "/~a/" s) out)]
-    [(byte-regexp? v)
-     (define s (string-replace (bytes->string/utf-8
-                                (cast (object-name v) Bytes))
-                               "/" "\\/"))
-     (write (format "/~a/" s) out)]
     [(void? v)
      (emit "null")]
     [else (error "Unexpected value: " v)]))
diff --git a/racketscript-compiler/racketscript/compiler/config.rkt b/racketscript-compiler/racketscript/compiler/config.rkt
index 7350dca5..ddf23215 100644
--- a/racketscript-compiler/racketscript/compiler/config.rkt
+++ b/racketscript-compiler/racketscript/compiler/config.rkt
@@ -27,7 +27,9 @@
          ignored-module-imports-in-boot
          ignored-undefined-identifier?
 
-         skip-arity-checks?)
+         skip-arity-checks?
+
+         use-scheme-numbers?)
 
 ;;; ---------------------------------------------------------------------------
 (define FFI-CALL-ID '#%js-ffi)
@@ -134,3 +136,9 @@
 
 (: skip-arity-checks? (Parameter Boolean))
 (define skip-arity-checks? (make-parameter #f))
+
+;;; ---------------------------------------------------------------------------
+
+;; Compiler flag for switching between JS and Scheme number semantics.
+(: use-scheme-numbers? (Parameter Boolean))
+(define use-scheme-numbers? (make-parameter #f))
diff --git a/racketscript-compiler/racketscript/compiler/directive.rkt b/racketscript-compiler/racketscript/compiler/directive.rkt
new file mode 100644
index 00000000..2afe65b5
--- /dev/null
+++ b/racketscript-compiler/racketscript/compiler/directive.rkt
@@ -0,0 +1,24 @@
+
+#lang racket/base
+
+(require (for-syntax racket
+                     syntax/parse))
+
+(provide #%rs-compiler
+         if-scheme-numbers)
+
+;; #%rs-compiler is treated specially by the compiler to implement
+;; compiler directives.
+(define #%rs-compiler
+  (lambda _
+    (#%app error 'racketscript "cannot use Racketscript compiler directive in Racket")))
+
+(define-syntax (if-scheme-numbers stx)
+  (syntax-parse stx
+    [(_ consequent:expr alternate:expr)
+     #'(#%rs-compiler 'if-scheme-numbers
+           consequent
+           alternate)]
+    [(_ consequent:expr)
+     #'(#%rs-compiler 'if-scheme-numbers
+                      consequent)]))
diff --git a/racketscript-compiler/racketscript/compiler/expand.rkt b/racketscript-compiler/racketscript/compiler/expand.rkt
index cbe1d51c..d501351f 100644
--- a/racketscript-compiler/racketscript/compiler/expand.rkt
+++ b/racketscript-compiler/racketscript/compiler/expand.rkt
@@ -134,7 +134,20 @@
     [((~datum all-from-except) p ...) '()]
     [((~datum for-meta) 1 p ...) '()]
     [((~datum for-syntax) p ...) '()]
-    [((~datum protect) p ...) '()]
+    [((~datum protect) p ...)
+     (apply append (stx-map parse-provide #'(p ...)))]
+    [((~datum struct) p (f ...))
+     (append
+      (list (SimpleProvide (syntax-e #'p))
+            (SimpleProvide (syntax-e (format-id #'p "make-~a" #'p)))
+            (SimpleProvide (syntax-e (format-id #'p "struct:~a" #'p)))
+            (SimpleProvide (syntax-e (format-id #'p "~a?" #'p))))
+      (stx-map ; accessors
+       (lambda (f) (syntax-e (format-id #'p "~a-~a" #'p f)))
+       #'(f ...))
+      (stx-map ; mutators
+       (lambda (f) (syntax-e (format-id #'p "set-~a-~a!" #'p f)))
+       #'(f ...)))]
     [_ #;(error "unsupported provide form " (syntax->datum r)) '()]))
 
 (define (formals->absyn formals)
@@ -356,14 +369,10 @@
     [_ #:when (prefab-struct-key (syntax-e v)) #f] ;; TODO: No error to compile FFI
     [_ #:when (box? (syntax-e v)) (box (parameterize ([quoted? #t])
                                          (to-absyn (unbox (syntax-e v)))))]
-    [_ #:when (exact-integer? (syntax-e v))
-       (Quote (syntax-e v))]
     [_ #:when (boolean? (syntax-e v)) (Quote (syntax-e v))]
     [_ #:when (keyword? (syntax-e v)) (Quote (syntax-e v))]
     [(~or (~datum +inf.0) (~datum -inf.0) (~datum nan.0))
      (Quote (syntax-e v))]
-    [_ #:when (real? (syntax-e v)) (Quote (syntax-e v))]
-    [_ #:when (complex? (syntax-e v)) #f]
     [_ #:when (char? (syntax-e v))
        (Quote (syntax-e v))]
     [_ #:when (regexp? (syntax-e v))
diff --git a/racketscript-compiler/racketscript/compiler/main.rkt b/racketscript-compiler/racketscript/compiler/main.rkt
index c28a6b58..734aed99 100644
--- a/racketscript-compiler/racketscript/compiler/main.rkt
+++ b/racketscript-compiler/racketscript/compiler/main.rkt
@@ -35,7 +35,8 @@
          racketscript-dir
          skip-npm-install
          enabled-optimizations
-         recompile-all-modules?)
+         recompile-all-modules?
+         use-scheme-numbers?)
 
 (define build-mode (make-parameter 'complete))
 (define skip-npm-install (make-parameter #f))
@@ -221,64 +222,64 @@
        (= (get-module-timestamp ts mod)
           (file-or-directory-modify-seconds (actual-module-path mod)))))
 
-;; -> Void
+;; -> (Setof Path)
 ;; For given global parameters starts build process starting
-;; with entry point module and all its dependencies
+;; with entry point module and all its dependencies. Returns
+;; a set module paths that were compiled (typically ignored).
 (define (racket->js)
   (define added (mutable-set))
   (define pending (make-queue))
-
-  ;; build directories to output build folder.
-  (define default-module-name (string-slice (~a (last-path-element
-                                                 (main-source-file)))
-                                            0 -4))
-  (prepare-build-directory default-module-name)
-
   (define (put-to-pending! mod)
     (unless (set-member? added mod)
       (set-add! added mod)
       (enqueue! pending mod)))
 
-  (define timestamps (load-cached-module-timestamps))
+  (define default-module-name (string-slice (~a (last-path-element
+                                                 (main-source-file)))
+                                            0 -4))
+  (prepare-build-directory default-module-name)
 
   (put-to-pending! (path->complete-path (main-source-file)))
   (for ([pm primitive-modules])
     (put-to-pending! pm))
 
-  (let loop ()
-    (define next (and (non-empty-queue? pending) (dequeue! pending)))
-    (cond
-      [(and next (skip-module-compile? timestamps next))
-       (log-rjs-info (~a "Skipping " next))
-       (loop)]
-      [next
-       (current-source-file next)
-       (make-directory* (path-only (module-output-file next)))
-       (save-module-timestamp! timestamps next)
-
-       (define expanded (quick-expand next))
-       (define ast (convert expanded (override-module-path next)))
-
-       (assemble-module (insert-arity-checks
-                         (absyn-module->il* ast))
-                        #f)
-
-       ;; Run JS beautifier
-       (when (js-output-beautify?)
-         (system (format "js-beautify -r ~a" (module-output-file next))))
-
-       (for ([mod (in-set (Module-imports ast))])
-         (match mod
-           [(? symbol? _) (void)]
-           [_ #:when (collects-module? mod) (void) (put-to-pending! mod)]
-           [_ (put-to-pending! mod)]))
-       (loop)]
-      [(false? next)
-       (dump-module-timestamps! timestamps)
-       (unless (equal? (js-target) "plain")
-         (log-rjs-info "Running NPM [Install/Build].")
-         (npm-install-build))
-       (log-rjs-info "Finished.")])))
+  (define timestamps (load-cached-module-timestamps))
+  (for ([(mod timestamp) timestamps])
+    (when (not (skip-module-compile? timestamps mod))
+      (put-to-pending! mod)))
+
+  (define compiled-modules
+    (for/set ([next (in-queue pending)]
+              #:unless (and (skip-module-compile? timestamps next)
+                            (log-rjs-info (~a "Skipping " next))))
+
+      (current-source-file next)
+      (make-directory* (path-only (module-output-file next)))
+      (save-module-timestamp! timestamps next)
+
+      (define expanded (quick-expand next))
+      (define ast (convert expanded (override-module-path next)))
+      (assemble-module (insert-arity-checks
+                        (absyn-module->il* ast))
+                       #f)
+
+      (when (js-output-beautify?)
+        (system (format "js-beautify -r ~a" (module-output-file next))))
+
+      (for ([mod (in-set (Module-imports ast))])
+        (match mod
+          [(? symbol? _) (void)]
+          [_ #:when (collects-module? mod) (put-to-pending! mod)]
+          [_ (put-to-pending! mod)]))
+
+      next))
+
+  (dump-module-timestamps! timestamps)
+  (unless (equal? (js-target) "plain")
+    (log-rjs-info "Running NPM [Install/Build].")
+    (npm-install-build))
+  (log-rjs-info "Finished.")
+  compiled-modules)
 
 ;; String -> String
 (define (js-string-beautify js-str)
@@ -314,6 +315,8 @@
     (enabled-optimizations (set-add (enabled-optimizations) flatten-if-else))]
    ["--lift-returns" "Translate self tail calls to loops"
     (enabled-optimizations (set-add (enabled-optimizations) lift-returns))]
+   ["--scheme-numbers" "Use Scheme number semantics"
+    (use-scheme-numbers? #t)]
    #:multi
    [("-t" "--target") target "Build target environment [plain|webpack|closure-compiler|babel]"
     (if (member target *targets*)
@@ -336,6 +339,7 @@
      [`(,_ ,#t) (error 'racketscript "Don't expect filename with `--stdin` mode")]
      [`(,filename ,#f)
       (let ([complete-filename (path->complete-path filename)])
+        (current-source-file complete-filename)
         (main-source-file complete-filename)
         complete-filename)])))
 
@@ -414,6 +418,34 @@
       (if (js-output-beautify?)
           (js-string-beautify (get-output-string output-string))
           (get-output-string output-string)))]
-    ['complete (racket->js)])
-
-  (void))
+    ['complete (racket->js) (void)]))
+
+(module+ test
+  (require rackunit)
+
+  (define tests-dir (normalize-path (build-path racketscript-dir
+                                                'up 'up
+                                                "tests")))
+
+  (test-case "check stale dependency compilation"
+    (define dep-cache-dir (build-path tests-dir "dep-cache"))
+    (define has-dependency (build-path dep-cache-dir
+                                       "has-dependency.rkt"))
+    (define dependency (normalize-path (build-path tests-dir
+                                                   "dep-cache"
+                                                   "private"
+                                                   "dependency.rkt")))
+    (parameterize ([main-source-file has-dependency]
+                   [global-export-graph (get-export-tree (list has-dependency))]
+                   [current-source-file has-dependency]
+                   [recompile-all-modules? #f]
+                   [current-output-port (open-output-nowhere)])
+      (file-or-directory-modify-seconds dependency 100)
+      (racket->js)
+      ;; Change dependency's modification time to simulate
+      ;; an edit to the source file.
+      (file-or-directory-modify-seconds dependency 200)
+      (check-true (set-member? (racket->js)
+                               dependency)
+                  "stale dependency not recompiled."))
+    (delete-directory/files (output-directory))))
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core.js b/racketscript-compiler/racketscript/compiler/runtime/core.js
index 126e8980..abbaeb75 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core.js
@@ -8,12 +8,12 @@ import * as UString from './core/unicode_string.js';
 import * as Regexp from './core/regexp.js';
 import * as Hash from './core/hash.js';
 import * as Keyword from './core/keyword.js';
-import * as Number from './core/numbers.js';
+import * as Number from './core/numbers/numbers.js';
 import * as Pair from './core/pair.js';
 import * as Ports from './core/ports.js';
 import * as Primitive from './core/primitive.js';
+import * as PrimitiveSymbol from './core/primitive_symbol.js';
 import * as Struct from './core/struct.js';
-import * as Symbol from './core/symbol.js';
 import * as Values from './core/values.js';
 import * as Vector from './core/vector.js';
 import * as Marks from './core/marks.js';
@@ -22,7 +22,6 @@ import * as Correlated from './core/correlated.js';
 import * as Linklet from './core/linklet.js';
 import * as Path from './core/path.js';
 
-
 export {
     Bytes,
     Number,
@@ -30,7 +29,7 @@ export {
     Pair,
     Primitive,
     Struct,
-    Symbol,
+    PrimitiveSymbol,
     Keyword,
     Values,
     Vector,
@@ -46,10 +45,7 @@ export {
     Path
 };
 
-export {
-    argumentsToArray,
-    argumentsSlice
-} from './core/lib.js';
+export { argumentsToArray, argumentsSlice } from './core/lib.js';
 
 export {
     racketCoreError,
@@ -64,28 +60,13 @@ export {
     errMsg
 } from './core/errors.js';
 
-export {
-    attachProcedureArity,
-    attachProcedureName
-} from './core/procedure.js';
+export { attachProcedureArity, attachProcedureName } from './core/procedure.js';
 
-export {
-    isEq,
-    isEqv,
-    isEqual
-} from './core/equality.js';
+export { isEq, isEqv, isEqual } from './core/equality.js';
 
-export {
-    hashForEq,
-    hashForEqv,
-    hashForEqual
-} from './core/hashing.js';
+export { hashForEq, hashForEqv, hashForEqual } from './core/hashing.js';
 
-export {
-    display,
-    write,
-    print
-} from './core/printing.js';
+export { display, write, print } from './core/printing.js';
 
 // ;-----------------------------------------------------------------------------
 
@@ -95,40 +76,40 @@ export function bitwiseNot(a) {
 
 class UnsafeUndefined extends PrintablePrimitive {
     equals(v) {
-        return (v === this);
+        return v === this;
     }
 
     /**
-     * @return {!number} a 32-bit integer
-     */
+   * @return {!number} a 32-bit integer
+   */
     hashForEqual() {
         return 0;
     }
 
     /**
-     * @param {!Ports.NativeStringOutputPort} out
-     */
+   * @param {!Ports.NativeStringOutputPort} out
+   */
     displayNativeString(out) {
         out.consume('#<unsafe-undefined>');
     }
 
     /**
-     * @param {!Ports.UStringOutputPort} out
-     */
+   * @param {!Ports.UStringOutputPort} out
+   */
     displayUString(out) {
         out.consume('#<unsafe-undefined>');
     }
 
     /**
-     * @param {!Ports.NativeStringOutputPort} out
-     */
+   * @param {!Ports.NativeStringOutputPort} out
+   */
     writeNativeString(out) {
         out.consume('#<unsafe-undefined>');
     }
 
     /**
-     * @param {!Ports.UStringOutputPort} out
-     */
+   * @param {!Ports.UStringOutputPort} out
+   */
     writeUString(out) {
         out.consume('#<unsafe-undefined>');
     }
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/bytes.js b/racketscript-compiler/racketscript/compiler/runtime/core/bytes.js
index 53d580b9..6d2499e9 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/bytes.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/bytes.js
@@ -28,6 +28,21 @@ export function ref(bs, i) {
     return bs[i];
 }
 
+
+/**
+ *
+ * @param Array of {!Uint8Array}
+ * @return {!Uint8Array}
+ */
+export function append(bss) {
+    let size = 0;
+    bss.forEach((bs) => { size += bs.length; });
+    const res = new Uint8Array(size);
+    let i = 0;
+    bss.forEach((bs) => { res.set(bs, i); i += bs.length; });
+    return res;
+}
+
 /**
  *
  * @param {!Uint8Array} bs
@@ -112,6 +127,7 @@ export function fromIntArray(ints) {
 }
 
 const utf8Decoder = new TextDecoder('utf-8');
+const latin1Decoder = new TextDecoder('latin1');
 
 /**
  * @param {!Uint8Array} bytes
@@ -121,6 +137,14 @@ export function toString(bytes) {
     return utf8Decoder.decode(bytes);
 }
 
+/**
+ * @param {!Uint8Array} bytes
+ * @return {!String}
+ */
+export function toLatin1String(bytes) {
+    return latin1Decoder.decode(bytes);
+}
+
 /**
  * Writes a string representation similar to Racket's `display` to the given port.
  *
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/equality.js b/racketscript-compiler/racketscript/compiler/runtime/core/equality.js
index 6bb6b80a..81be9dd6 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/equality.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/equality.js
@@ -1,6 +1,12 @@
 import * as Primitive from './primitive.js';
+import * as PrimitiveSymbol from './primitive_symbol.js';
 import * as Char from './char.js';
 import * as Bytes from './bytes.js';
+import {
+    isSchemeNumber,
+    equals as schemeEquals,
+    eqv as schemeEqv
+} from './numbers/scheme-numbers.js';
 
 /**
  * @param {*} v1
@@ -8,6 +14,10 @@ import * as Bytes from './bytes.js';
  * @return {!boolean}
  */
 export function isEq(v1, v2) {
+    // Handle Symbols
+    if (PrimitiveSymbol.check(v1)) {
+        return v1.equals(v2);
+    }
     return v1 === v2;
 }
 
@@ -17,12 +27,17 @@ export function isEq(v1, v2) {
  * @return {!boolean}
  */
 export function isEqv(v1, v2) {
-    // NOTE: We are not handling special case for Symbol.
-    // Symbols and keywords are interned, so that's ok.
+    if (useSchemeEquality(v1, v2)) {
+        return schemeEqv(v1, v2);
+    }
+
+    // Handle Symbols
+    if (PrimitiveSymbol.check(v1)) {
+        return v1.equals(v2);
+    }
 
     // TODO: Handle numbers correctly.
-    return v1 === v2 ||
-        Char.check(v1) && Char.check(v2) && Char.eq(v1, v2);
+    return v1 === v2 || (Char.check(v1) && Char.check(v2) && Char.eq(v1, v2));
 }
 
 /**
@@ -32,6 +47,11 @@ export function isEqv(v1, v2) {
  */
 export function isEqual(v1, v2) {
     if (v1 === v2) return true;
+
+    if (useSchemeEquality(v1, v2)) {
+        return schemeEquals(v1, v2);
+    }
+
     if (Primitive.check(v1)) return v1.equals(v2);
 
     // Bytes are not a Primitive.
@@ -39,3 +59,13 @@ export function isEqual(v1, v2) {
 
     return false;
 }
+
+function useSchemeEquality(v1, v2) {
+    if (typeof v1 === 'number' && !Number.isInteger(v1)) {
+        return false;
+    }
+    if (typeof v2 === 'number' && !Number.isInteger(v2)) {
+        return false;
+    }
+    return isSchemeNumber(v1) && isSchemeNumber(v2);
+}
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/errors.js b/racketscript-compiler/racketscript/compiler/runtime/core/errors.js
index b4d0072c..ae6d6524 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/errors.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/errors.js
@@ -37,8 +37,7 @@ function makeError(name) {
     e.prototype = Object.create(Error.prototype);
     e.prototype.constructor = e;
 
-    return (...args) =>
-        new (Function.prototype.bind.apply(e, [this].concat(args)))();
+    return (...args) => new (Function.prototype.bind.apply(e, [this].concat(args)))();
 }
 
 export const racketCoreError = makeError('RacketCoreError');
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/hamt.js b/racketscript-compiler/racketscript/compiler/runtime/core/hamt.js
index 6bec5955..b690cd8d 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/hamt.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/hamt.js
@@ -1,4 +1,6 @@
-
+// Copyright (C) 2016-2021 Matt Bierner, RacketScript Authors
+//
+// Original source and copyright clause: https://github.com/mattbierner/hamt_plus
 
 const _typeof = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol'
     ? function (obj) { return typeof obj; }
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/marks.js b/racketscript-compiler/racketscript/compiler/runtime/core/marks.js
index f589b3b6..6177189d 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/marks.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/marks.js
@@ -1,14 +1,13 @@
 // Continuation Marks
 import * as Pair from './pair.js';
-import * as Symbol from './symbol.js';
+import * as PrimitiveSymbol from './primitive_symbol.js';
 import { racketCoreError } from './errors.js';
 import { hashForEq as HASH } from './hashing.js';
 
 let __frames;
 const __prompts = new Map();
 const __asyncCallbackWrappers = [];
-const __defaultContinuationPromptTag
-    = makeContinuationPromptTag(Symbol.make('default'));
+const __defaultContinuationPromptTag = makeContinuationPromptTag(PrimitiveSymbol.make('default'));
 
 /* --------------------------------------------------------------------------*/
 
@@ -46,11 +45,11 @@ export function AbortCurrentContinuation(promptTag, handlerArgs) {
     this.promptTag = promptTag;
     this.handlerArgs = handlerArgs;
 
-    this.stack = (new Error()).stack;
+    this.stack = new Error().stack;
     if (Error.captureStackTrace) {
         Error.captureStackTrace(this, this.constructor);
     } else {
-        this.stack = (new Error()).stack;
+        this.stack = new Error().stack;
     }
 }
 AbortCurrentContinuation.prototype = Object.create(Error.prototype);
@@ -82,8 +81,7 @@ function getPromptFrame(promptTag) {
         return promptTag;
     }
     const result = __prompts.get(promptTag);
-    return (result && result[result.length - 1])
-            || undefined;
+    return (result && result[result.length - 1]) || undefined;
 }
 
 export function makeContinuationPromptTag(sym) {
@@ -100,8 +98,7 @@ export function callWithContinuationPrompt(proc, promptTag, handler, ...args) {
         savePrompt(promptTag);
         return proc(...args);
     } catch (e) {
-        if (e instanceof AbortCurrentContinuation &&
-            e.promptTag === promptTag) {
+        if (e instanceof AbortCurrentContinuation && e.promptTag === promptTag) {
             return handler(...e.handlerArgs);
         }
         throw e;
@@ -139,8 +136,10 @@ export function getContinuationMarks(promptTag) {
     promptTag = promptTag || __defaultContinuationPromptTag;
     let frames = __frames;
     const promptFrame = getPromptFrame(promptTag);
-    if (promptFrame === undefined &&
-        promptTag !== __defaultContinuationPromptTag) {
+    if (
+        promptFrame === undefined &&
+    promptTag !== __defaultContinuationPromptTag
+    ) {
         throw racketCoreError('No corresponding tag in continuation!');
     }
 
@@ -162,7 +161,7 @@ export function getMarks(framesArr, key, promptTag) {
 
     const result = [];
     for (let ii = 0; ii < framesArr.length; ++ii) {
-        // FIXME: for-of requires polyfill
+    // FIXME: for-of requires polyfill
         const fr = framesArr[ii];
         if (keyHash in fr) {
             if (fr === promptFrame) {
@@ -178,11 +177,13 @@ export function getMarks(framesArr, key, promptTag) {
 // and parameterization and check if that if this needs
 export function getFirstMark(frames, key, noneV) {
     const keyHash = HASH(key);
-    return Pair.listFind(frames, (fr) => {
-        if (keyHash in fr) {
-            return fr[keyHash];
-        }
-    }) || noneV;
+    return (
+        Pair.listFind(frames, (fr) => {
+            if (keyHash in fr) {
+                return fr[keyHash];
+            }
+        }) || noneV
+    );
 }
 
 export function wrapWithContext(fn) {
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/numbers.js b/racketscript-compiler/racketscript/compiler/runtime/core/numbers/js-numbers.js
similarity index 78%
rename from racketscript-compiler/racketscript/compiler/runtime/core/numbers.js
rename to racketscript-compiler/racketscript/compiler/runtime/core/numbers/js-numbers.js
index 4032ea5a..15aa54e7 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/numbers.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/numbers/js-numbers.js
@@ -1,4 +1,4 @@
-import { racketCoreError } from './errors.js';
+import { racketCoreError } from '../errors.js';
 
 /* Arithmetic */
 
@@ -72,3 +72,21 @@ export function equals(...operands) {
 export function check(v) {
     return typeof v === 'number';
 }
+
+/* Bitwise operators */
+
+export function bitwiseOr(...operands) {
+    return [].reduce.call(operands, (a, b) => a | b, 0);
+}
+
+export function bitwiseXor(...operands) {
+    return [].reduce.call(operands, (a, b) => a ^ b, 0);
+}
+
+export function bitwiseAnd(...operands) {
+    return [].reduce.call(operands, (a, b) => a & b, -1);
+}
+
+export function bitwiseNot(v) {
+    return ~v;
+}
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/numbers/numbers.js b/racketscript-compiler/racketscript/compiler/runtime/core/numbers/numbers.js
new file mode 100644
index 00000000..d3764dbb
--- /dev/null
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/numbers/numbers.js
@@ -0,0 +1,7 @@
+import * as Scheme from './scheme-numbers.js';
+import * as JS from './js-numbers.js';
+
+export {
+    Scheme,
+    JS
+};
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/numbers/scheme-numbers.js b/racketscript-compiler/racketscript/compiler/runtime/core/numbers/scheme-numbers.js
new file mode 100644
index 00000000..80b2db0b
--- /dev/null
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/numbers/scheme-numbers.js
@@ -0,0 +1,4470 @@
+// Taken from https://github.com/dyoo/js-numbers/blob/master/src/js-numbers.js
+// and originally written by Danny Yoo (dyoo@cs.wpi.edu)
+// The original license is provided below. Modifications to the original
+// source are made under the Racketscript license.
+//
+//
+// // Licensing
+// ---------
+//
+// This software is covered under the following copyright:
+//
+// /*
+// * Copyright (c) 2010  Danny Yoo
+// * All Rights Reserved.
+// *
+// * Permission is hereby granted, free of charge, to any person obtaining
+// * a copy of this software and associated documentation files (the
+// * "Software"), to deal in the Software without restriction, including
+// * without limitation the rights to use, copy, modify, merge, publish,
+// * distribute, sublicense, and/or sell copies of the Software, and to
+// * permit persons to whom the Software is furnished to do so, subject to
+// * the following conditions:
+// *
+// * The above copyright notice and this permission notice shall be
+// * included in all copies or substantial portions of the Software.
+// *
+// * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+// * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+// * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+// *
+// * IN NO EVENT SHALL TOM WU BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
+// * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
+// * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
+// * THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
+// * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+// *
+// * In addition, the following condition applies:
+// *
+// * All redistributions must retain an intact copy of this copyright notice
+// * and disclaimer.
+// */
+//
+//
+//
+//
+//
+// ======================================================================
+//
+// js-numbers uses code from the jsbn library.  The LICENSE to it is:
+//
+// Licensing
+// ---------
+//
+// This software is covered under the following copyright:
+//
+// /*
+// * Copyright (c) 2003-2005  Tom Wu
+// * All Rights Reserved.
+// *
+// * Permission is hereby granted, free of charge, to any person obtaining
+// * a copy of this software and associated documentation files (the
+// * "Software"), to deal in the Software without restriction, including
+// * without limitation the rights to use, copy, modify, merge, publish,
+// * distribute, sublicense, and/or sell copies of the Software, and to
+// * permit persons to whom the Software is furnished to do so, subject to
+// * the following conditions:
+// *
+// * The above copyright notice and this permission notice shall be
+// * included in all copies or substantial portions of the Software.
+// *
+// * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+// * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+// * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+// *
+// * IN NO EVENT SHALL TOM WU BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
+// * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
+// * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
+// * THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
+// * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+// *
+// * In addition, the following condition applies:
+// *
+// * All redistributions must retain an intact copy of this copyright notice
+// * and disclaimer.
+// */
+//
+// Address all questions regarding this license to:
+//
+// Tom Wu
+// tjw@cs.Stanford.EDU
+
+
+// Scheme numbers.
+
+// The numeric tower has the following levels:
+//     integers
+//     rationals
+//     floats
+//     complex numbers
+//
+// with the representations:
+//     integers: fixnum or BigInteger [level=0]
+//     rationals: Rational [level=1]
+//     floats: FloatPoint [level=2]
+//     complex numbers: Complex [level=3]
+
+// We try to stick with the unboxed fixnum representation for
+// integers, since that's what scheme programs commonly deal with, and
+// we want that common type to be lightweight.
+
+
+// A boxed-scheme-number is either BigInteger, Rational, FloatPoint, or Complex.
+// An integer-scheme-number is either fixnum or BigInteger.
+
+// Abbreviation
+var Numbers = {};
+
+// makeNumericBinop: (fixnum fixnum -> any) (scheme-number scheme-number -> any) -> (scheme-number scheme-number) X
+// Creates a binary function that works either on fixnums or boxnums.
+// Applies the appropriate binary function, ensuring that both scheme numbers are
+// lifted to the same level.
+var makeNumericBinop = function(onFixnums, onBoxednums, options) {
+    options = options || {};
+    return function(x, y) {
+        if (options.isXSpecialCase && options.isXSpecialCase(x))
+            return options.onXSpecialCase(x, y);
+        if (options.isYSpecialCase && options.isYSpecialCase(y))
+            return options.onYSpecialCase(x, y);
+        if (typeof(x) === 'number' &&
+            typeof(y) === 'number') {
+            return onFixnums(x, y);
+        }
+        if (typeof(x) === 'number') {
+            x = liftFixnumInteger(x, y);
+        }
+        if (typeof(y) === 'number') {
+            y = liftFixnumInteger(y, x);
+        }
+        if (x.level < y.level) x = x.liftTo(y);
+        if (y.level < x.level) y = y.liftTo(x);
+        return onBoxednums(x, y);
+    };
+}
+
+// fromFixnum: fixnum -> scheme-number
+var fromFixnum = function(x) {
+    if (isNaN(x) || (!isFinite(x))) {
+        return FloatPoint.makeInstance(x);
+    }
+    var nf = Math.floor(x);
+    if (nf === x) {
+        if (isOverflow(nf)) {
+            return makeBignum(expandExponent(x + ''));
+        } else {
+            return nf;
+        }
+    } else {
+        return FloatPoint.makeInstance(x);
+    }
+};
+var expandExponent = function(s) {
+    var match = s.match(scientificPattern),
+        mantissaChunks, exponent;
+    if (match) {
+        mantissaChunks = match[1].match(/^([^.]*)(.*)$/);
+        exponent = Number(match[2]);
+        if (mantissaChunks[2].length === 0) {
+            return mantissaChunks[1] + zfill(exponent);
+        }
+        if (exponent >= mantissaChunks[2].length - 1) {
+            return (mantissaChunks[1] +
+                mantissaChunks[2].substring(1) +
+                zfill(exponent - (mantissaChunks[2].length - 1)));
+        } else {
+            return (mantissaChunks[1] +
+                mantissaChunks[2].substring(1, 1 + exponent));
+        }
+    } else {
+        return s;
+    }
+};
+// zfill: integer -> string
+// builds a string of "0"'s of length n.
+var zfill = function(n) {
+    var buffer = [];
+    buffer.length = n;
+    for (var i = 0; i < n; i++) {
+        buffer[i] = '0';
+    }
+    return buffer.join('');
+};
+
+// liftFixnumInteger: fixnum-integer boxed-scheme-number -> boxed-scheme-number
+// Lifts up fixnum integers to a boxed type.
+var liftFixnumInteger = function(x, other) {
+    switch (other.level) {
+        case 0: // BigInteger
+            return makeBignum(x);
+        case 1: // Rational
+            return new Rational(x, 1);
+        case 2: // FloatPoint
+            return new FloatPoint(x);
+        case 3: // Complex
+            return new Complex(x, 0);
+        default:
+            throwRuntimeError("IMPOSSIBLE: cannot lift fixnum integer to " + other.toString(), x, other);
+    }
+};
+
+// throwRuntimeError: string (scheme-number | undefined) (scheme-number | undefined) -> void
+// Throws a runtime error with the given message string.
+var throwRuntimeError = function(msg, x, y) {
+    Numbers['onThrowRuntimeError'](msg, x, y);
+};
+
+// onThrowRuntimeError: string (scheme-number | undefined) (scheme-number | undefined) -> void
+// By default, will throw a new Error with the given message.
+// Override Numbers['onThrowRuntimeError'] if you need to do something special.
+var onThrowRuntimeError = function(msg, x, y) {
+    throw new Error(msg);
+};
+
+// isSchemeNumber: any -> boolean
+// Returns true if the thing is a scheme number.
+var isSchemeNumber = function(thing) {
+    return (typeof(thing) === 'number' ||
+        (thing instanceof Rational ||
+            thing instanceof FloatPoint ||
+            thing instanceof Complex ||
+            thing instanceof BigInteger));
+};
+
+// isRational: scheme-number -> boolean
+var isRational = function(n) {
+    return (typeof(n) === 'number' ||
+        (isSchemeNumber(n) && n.isRational()));
+};
+// isReal: scheme-number -> boolean
+var isReal = function(n) {
+    return (typeof(n) === 'number' ||
+        (isSchemeNumber(n) && n.isReal()));
+};
+// isExact: scheme-number -> boolean
+var isExact = function(n) {
+    return (typeof(n) === 'number' ||
+        (isSchemeNumber(n) && n.isExact()));
+};
+// isExact: scheme-number -> boolean
+var isInexact = function(n) {
+    if (typeof(n) === 'number') {
+        return false;
+    } else {
+        return (isSchemeNumber(n) && n.isInexact());
+    }
+};
+// isInteger: scheme-number -> boolean
+var isInteger = function(n) {
+    return (typeof(n) === 'number' ||
+        (isSchemeNumber(n) && n.isInteger()));
+};
+// isExactInteger: scheme-number -> boolean
+var isExactInteger = function(n) {
+    return (typeof(n) === 'number' ||
+        (isSchemeNumber(n) &&
+            n.isInteger() &&
+            n.isExact()));
+}
+
+// toFixnum: scheme-number -> javascript-number
+var toFixnum = function(n) {
+    if (typeof(n) === 'number')
+        return n;
+    return n.toFixnum();
+};
+// toExact: scheme-number -> scheme-number
+var toExact = function(n) {
+    if (typeof(n) === 'number')
+        return n;
+    return n.toExact();
+};
+
+// toExact: scheme-number -> scheme-number
+var toInexact = function(n) {
+    if (typeof(n) === 'number')
+        return FloatPoint.makeInstance(n);
+    return n.toInexact();
+};
+
+//////////////////////////////////////////////////////////////////////
+
+// Takes a two argument function and makes it multi-arity.
+// Can provide an alternative function for when called with
+// a single argument or no arguments.
+function makeMultiArityArithmetic(multiArg, singleArg=false, noArg=false) {
+    function quickReduce(array) {
+        let result = array[0];
+        for (let i = 1; i < array.length; i++) {
+            result = multiArg(result, array[i]);
+        }
+        return result;
+    }
+
+    if (noArg && singleArg) {
+        return function(...operands) {
+            if (operands.length === 0) {
+                return noArg();
+            } else if (operands.length === 1) {
+                return singleArg(operands[0]);
+            }
+            return quickReduce(operands);
+        }
+    }
+
+    if (singleArg) {
+        return function(...operands) {
+            if (operands.length === 1) {
+                return singleArg(operands[0]);
+            }
+            quickReduce(operands);
+        }
+    }
+
+    if (!singleArge && !noArg) {
+        return function(...operands) {
+            quickReduce(operands);
+        }
+    }
+
+    throwRuntimeError("singleArg must be provided if noArg is provided.");
+}
+
+// multiAdd: multi-arity version of add.
+var multiAdd = makeMultiArityArithmetic(add, (value) => value, () => 0);
+
+// add: scheme-number scheme-number -> scheme-number
+var add = function(x, y) {
+    var sum;
+    if (typeof(x) === 'number' && typeof(y) === 'number') {
+        sum = x + y;
+        if (isOverflow(sum)) {
+            return (makeBignum(x)).add(makeBignum(y));
+        }
+    }
+    if (x instanceof FloatPoint && y instanceof FloatPoint) {
+        return x.add(y);
+    }
+    return addSlow(x, y);
+};
+var addSlow = makeNumericBinop(
+    function(x, y) {
+        var sum = x + y;
+        if (isOverflow(sum)) {
+            return (makeBignum(x)).add(makeBignum(y));
+        } else {
+            return sum;
+        }
+    },
+    function(x, y) {
+        return x.add(y);
+    }, {
+        isXSpecialCase: function(x) {
+            return isExactInteger(x) && _integerIsZero(x)
+        },
+        onXSpecialCase: function(x, y) {
+            return y;
+        },
+        isYSpecialCase: function(y) {
+            return isExactInteger(y) && _integerIsZero(y)
+        },
+        onYSpecialCase: function(x, y) {
+            return x;
+        }
+    });
+
+// multiSub: multi-arity version of subtract.
+var multiSub = makeMultiArityArithmetic(subtract, (value) => subtract(0, value));
+
+// subtract: scheme-number scheme-number -> scheme-number
+var subtract = makeNumericBinop(
+    function(x, y) {
+        var diff = x - y;
+        if (isOverflow(diff)) {
+            return (makeBignum(x)).subtract(makeBignum(y));
+        } else {
+            return diff;
+        }
+    },
+    function(x, y) {
+        return x.subtract(y);
+    }, {
+        isXSpecialCase: function(x) {
+            return isExactInteger(x) && _integerIsZero(x)
+        },
+        onXSpecialCase: function(x, y) {
+            return negate(y);
+        },
+        isYSpecialCase: function(y) {
+            return isExactInteger(y) && _integerIsZero(y)
+        },
+        onYSpecialCase: function(x, y) {
+            return x;
+        }
+    });
+
+// mul: multi-arity version of multiply.
+var multiMultiply = makeMultiArityArithmetic(multiply, (value) => value, () => 1);
+
+// mulitply: scheme-number scheme-number -> scheme-number
+var multiply = function(x, y) {
+    var prod;
+    if (typeof(x) === 'number' && typeof(y) === 'number') {
+        prod = x * y;
+        if (isOverflow(prod)) {
+            return (makeBignum(x)).multiply(makeBignum(y));
+        } else {
+            return prod;
+        }
+    }
+    if (x instanceof FloatPoint && y instanceof FloatPoint) {
+        return x.multiply(y);
+    }
+    return multiplySlow(x, y);
+};
+var multiplySlow = makeNumericBinop(
+    function(x, y) {
+        var prod = x * y;
+        if (isOverflow(prod)) {
+            return (makeBignum(x)).multiply(makeBignum(y));
+        } else {
+            return prod;
+        }
+    },
+    function(x, y) {
+        return x.multiply(y);
+    }, {
+        isXSpecialCase: function(x) {
+            return (isExactInteger(x) &&
+                (_integerIsZero(x) || _integerIsOne(x) || _integerIsNegativeOne(x)))
+        },
+        onXSpecialCase: function(x, y) {
+            if (_integerIsZero(x))
+                return 0;
+            if (_integerIsOne(x))
+                return y;
+            if (_integerIsNegativeOne(x))
+                return negate(y);
+        },
+        isYSpecialCase: function(y) {
+            return (isExactInteger(y) &&
+                (_integerIsZero(y) || _integerIsOne(y) || _integerIsNegativeOne(y)))
+        },
+        onYSpecialCase: function(x, y) {
+            if (_integerIsZero(y))
+                return 0;
+            if (_integerIsOne(y))
+                return x;
+            if (_integerIsNegativeOne(y))
+                return negate(x);
+        }
+    });
+
+// div: multi-arity version of divide.
+var multiDivide = makeMultiArityArithmetic(divide, (value) => divide(1, value));
+
+// divide: scheme-number scheme-number -> scheme-number
+var divide = makeNumericBinop(
+    function(x, y) {
+        if (_integerIsZero(y))
+            throwRuntimeError("/: division by zero", x, y);
+        var div = x / y;
+        if (isOverflow(div)) {
+            return (makeBignum(x)).divide(makeBignum(y));
+        } else if (Math.floor(div) !== div) {
+            return Rational.makeInstance(x, y);
+        } else {
+            return div;
+        }
+    },
+    function(x, y) {
+        return x.divide(y);
+    }, {
+        isXSpecialCase: function(x) {
+            return (eqv(x, 0));
+        },
+        onXSpecialCase: function(x, y) {
+            if (eqv(y, 0)) {
+                throwRuntimeError("/: division by zero", x, y);
+            }
+            return 0;
+        },
+        isYSpecialCase: function(y) {
+            return (eqv(y, 0));
+        },
+        onYSpecialCase: function(x, y) {
+            throwRuntimeError("/: division by zero", x, y);
+        }
+    });
+
+// Makes a multi-arity comparison function.
+function makeMultiArityComparison(compare) {
+    return function(...operands) {
+        if (operands.length === 1) {
+            return true;
+        }
+        for (let i = 1; i < operands.length; i++) {
+            if (!compare(operands[i - 1], operands[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
+
+
+// equals: scheme-number scheme-number -> boolean
+var equals = makeNumericBinop(
+    function(x, y) {
+        return x === y;
+    },
+    function(x, y) {
+        return x.equals(y);
+    });
+
+// eqv: scheme-number scheme-number -> boolean
+var eqv = function(x, y) {
+    if (x === y)
+        return true;
+    if (typeof(x) === 'number' && typeof(y) === 'number')
+        return x === y;
+    if (x === NEGATIVE_ZERO || y === NEGATIVE_ZERO)
+        return x === y;
+    if (x instanceof Complex || y instanceof Complex) {
+        return (eqv(realPart(x), realPart(y)) &&
+            eqv(imaginaryPart(x), imaginaryPart(y)));
+    }
+    var ex = isExact(x),
+        ey = isExact(y);
+    return (((ex && ey) || (!ex && !ey)) && equals(x, y));
+};
+// approxEqual: scheme-number scheme-number scheme-number -> boolean
+var approxEquals = function(x, y, delta) {
+    return lessThan(abs(subtract(x, y)),
+        delta);
+};
+// greaterThanOrEqual: scheme-number scheme-number -> boolean
+var greaterThanOrEqual = makeNumericBinop(
+    function(x, y) {
+        return x >= y;
+    },
+    function(x, y) {
+        if (!(isReal(x) && isReal(y)))
+            throwRuntimeError(
+                ">=: couldn't be applied to complex number", x, y);
+        return x.greaterThanOrEqual(y);
+    });
+
+// lessThanOrEqual: scheme-number scheme-number -> boolean
+var lessThanOrEqual = makeNumericBinop(
+    function(x, y) {
+        return x <= y;
+    },
+    function(x, y) {
+        if (!(isReal(x) && isReal(y)))
+            throwRuntimeError("<=: couldn't be applied to complex number", x, y);
+        return x.lessThanOrEqual(y);
+    });
+
+// greaterThan: scheme-number scheme-number -> boolean
+var greaterThan = makeNumericBinop(
+    function(x, y) {
+        return x > y;
+    },
+    function(x, y) {
+        if (!(isReal(x) && isReal(y)))
+            throwRuntimeError(">: couldn't be applied to complex number", x, y);
+        return x.greaterThan(y);
+    });
+
+// lessThan: scheme-number scheme-number -> boolean
+var lessThan = makeNumericBinop(
+    function(x, y) {
+        return x < y;
+    },
+    function(x, y) {
+        if (!(isReal(x) && isReal(y)))
+            throwRuntimeError("<: couldn't be applied to complex number", x, y);
+        return x.lessThan(y);
+    });
+
+// expt: scheme-number scheme-number -> scheme-number
+var expt = (function() {
+    var _expt = makeNumericBinop(
+        function(x, y) {
+            var pow = Math.pow(x, y);
+            if (isOverflow(pow)) {
+                return (makeBignum(x)).expt(makeBignum(y));
+            } else {
+                return pow;
+            }
+        },
+        function(x, y) {
+            if (equals(y, 0)) {
+                return add(y, 1);
+            } else {
+                return x.expt(y);
+            }
+        });
+    return function(x, y) {
+        if (equals(y, 0))
+            return add(y, 1);
+        if (isReal(y) && lessThan(y, 0)) {
+            return _expt(divide(1, x), negate(y));
+        }
+        return _expt(x, y);
+    };
+})();
+
+// exp: scheme-number -> scheme-number
+var exp = function(n) {
+    if (eqv(n, 0)) {
+        return 1;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.exp(n));
+    }
+    return n.exp();
+};
+
+// modulo: scheme-number scheme-number -> scheme-number
+var modulo = function(m, n) {
+    if (!isInteger(m)) {
+        throwRuntimeError('modulo: the first argument ' +
+            m + " is not an integer.", m, n);
+    }
+    if (!isInteger(n)) {
+        throwRuntimeError('modulo: the second argument ' +
+            n + " is not an integer.", m, n);
+    }
+    var result;
+    if (typeof(m) === 'number') {
+        result = m % n;
+        if (n < 0) {
+            if (result <= 0)
+                return result;
+            else
+                return result + n;
+        } else {
+            if (result < 0)
+                return result + n;
+            else
+                return result;
+        }
+    }
+    result = _integerModulo(floor(m), floor(n));
+    // The sign of the result should match the sign of n.
+    if (lessThan(n, 0)) {
+        if (lessThanOrEqual(result, 0)) {
+            return result;
+        }
+        return add(result, n);
+    } else {
+        if (lessThan(result, 0)) {
+            return add(result, n);
+        }
+        return result;
+    }
+};
+
+// numerator: scheme-number -> scheme-number
+var numerator = function(n) {
+    if (typeof(n) === 'number')
+        return n;
+    return n.numerator();
+};
+
+// denominator: scheme-number -> scheme-number
+var denominator = function(n) {
+    if (typeof(n) === 'number')
+        return 1;
+    return n.denominator();
+};
+// sqrt: scheme-number -> scheme-number
+var sqrt = function(n) {
+    if (typeof(n) === 'number') {
+        if (n >= 0) {
+            var result = Math.sqrt(n);
+            if (Math.floor(result) === result) {
+                return result;
+            } else {
+                return FloatPoint.makeInstance(result);
+            }
+        } else {
+            return (Complex.makeInstance(0, sqrt(-n)));
+        }
+    }
+    return n.sqrt();
+};
+// abs: scheme-number -> scheme-number
+var abs = function(n) {
+    if (typeof(n) === 'number') {
+        return Math.abs(n);
+    }
+    return n.abs();
+};
+// floor: scheme-number -> scheme-number
+var floor = function(n) {
+    if (typeof(n) === 'number')
+        return n;
+    return n.floor();
+};
+// ceiling: scheme-number -> scheme-number
+var ceiling = function(n) {
+    if (typeof(n) === 'number') {
+      return Math.ceil(n);
+    }
+    return n.ceiling();
+};
+// conjugate: scheme-number -> scheme-number
+var conjugate = function(n) {
+    if (typeof(n) === 'number')
+        return n;
+    return n.conjugate();
+};
+// magnitude: scheme-number -> scheme-number
+var magnitude = function(n) {
+    if (typeof(n) === 'number')
+        return Math.abs(n);
+    return n.magnitude();
+};
+
+// log: scheme-number -> scheme-number
+var log = function(n) {
+    if (eqv(n, 1)) {
+        return 0;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.log(n));
+    }
+    return n.log();
+};
+// angle: scheme-number -> scheme-number
+var angle = function(n) {
+    if (typeof(n) === 'number') {
+        if (n > 0)
+            return 0;
+        else
+            return FloatPoint.pi;
+    }
+    return n.angle();
+};
+// tan: scheme-number -> scheme-number
+var tan = function(n) {
+    if (eqv(n, 0)) {
+        return 0;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.tan(n));
+    }
+    return n.tan();
+};
+// atan: scheme-number -> scheme-number
+var atan = function(n) {
+    if (eqv(n, 0)) {
+        return 0;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.atan(n));
+    }
+    return n.atan();
+};
+
+var atan2 = function(y, x) {
+    if (typeof(y) == 'number' && typeof(x) == 'number') {
+        return FloatPoint.makeInstance(Math.atan2(y, x))
+    }
+    y = toInexact(y);
+    x = toInexact(x);
+    return FloatPoint.makeInstance(Math.atan2(y.n, x.n))
+}
+// cos: scheme-number -> scheme-number
+var cos = function(n) {
+    if (eqv(n, 0)) {
+        return 1;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.cos(n));
+    }
+    return n.cos();
+};
+// sin: scheme-number -> scheme-number
+var sin = function(n) {
+    if (eqv(n, 0)) {
+        return 0;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.sin(n));
+    }
+    return n.sin();
+};
+// acos: scheme-number -> scheme-number
+var acos = function(n) {
+    if (eqv(n, 1)) {
+        return 0;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.acos(n));
+    }
+    return n.acos();
+};
+// asin: scheme-number -> scheme-number
+var asin = function(n) {
+    if (eqv(n, 0)) {
+        return 0;
+    }
+    if (typeof(n) === 'number') {
+        return FloatPoint.makeInstance(Math.asin(n));
+    }
+    return n.asin();
+};
+// imaginaryPart: scheme-number -> scheme-number
+var imaginaryPart = function(n) {
+    if (typeof(n) === 'number') {
+        return 0;
+    }
+    return n.imaginaryPart();
+};
+// realPart: scheme-number -> scheme-number
+var realPart = function(n) {
+    if (typeof(n) === 'number') {
+        return n;
+    }
+    return n.realPart();
+};
+// round: scheme-number -> scheme-number
+var round = function(n) {
+    if (typeof(n) === 'number') {
+        return n;
+    }
+    return n.round();
+};
+
+// sqr: scheme-number -> scheme-number
+var sqr = function(x) {
+    return multiply(x, x);
+};
+
+// integerSqrt: scheme-number -> scheme-number
+var integerSqrt = function(x) {
+    if (!isInteger(x)) {
+        throwRuntimeError('integer-sqrt: the argument ' + x.toString() +
+            " is not an integer.", x);
+    }
+    if (typeof(x) === 'number') {
+        if (x < 0) {
+            return Complex.makeInstance(0,
+                Math.floor(Math.sqrt(-x)))
+        } else {
+            return Math.floor(Math.sqrt(x));
+        }
+    }
+    return x.integerSqrt();
+};
+
+// gcd: scheme-number [scheme-number ...] -> scheme-number
+var gcd = function(first, rest) {
+    if (!isInteger(first)) {
+        throwRuntimeError('gcd: the argument ' + first.toString() +
+            " is not an integer.", first);
+    }
+    var a = abs(first),
+        t, b;
+    for (var i = 0; i < rest.length; i++) {
+        b = abs(rest[i]);
+        if (!isInteger(b)) {
+            throwRuntimeError('gcd: the argument ' + b.toString() +
+                " is not an integer.", b);
+        }
+        while (!_integerIsZero(b)) {
+            t = a;
+            a = b;
+            b = _integerModulo(t, b);
+        }
+    }
+    return a;
+};
+// lcm: scheme-number [scheme-number ...] -> scheme-number
+var lcm = function(first, rest) {
+    if (!isInteger(first)) {
+        throwRuntimeError('lcm: the argument ' + first.toString() +
+            " is not an integer.", first);
+    }
+    var result = abs(first);
+    if (_integerIsZero(result)) {
+        return 0;
+    }
+    for (var i = 0; i < rest.length; i++) {
+        if (!isInteger(rest[i])) {
+            throwRuntimeError('lcm: the argument ' + rest[i].toString() +
+                " is not an integer.", rest[i]);
+        }
+        var divisor = _integerGcd(result, rest[i]);
+        if (_integerIsZero(divisor)) {
+            return 0;
+        }
+        result = divide(multiply(result, rest[i]), divisor);
+    }
+    return result;
+};
+
+var quotient = function(x, y) {
+    if (!isInteger(x)) {
+        throwRuntimeError('quotient: the first argument ' + x.toString() +
+            " is not an integer.", x);
+    }
+    if (!isInteger(y)) {
+        throwRuntimeError('quotient: the second argument ' + y.toString() +
+            " is not an integer.", y);
+    }
+    return _integerQuotient(x, y);
+};
+
+var remainder = function(x, y) {
+    if (!isInteger(x)) {
+        throwRuntimeError('remainder: the first argument ' + x.toString() +
+            " is not an integer.", x);
+    }
+    if (!isInteger(y)) {
+        throwRuntimeError('remainder: the second argument ' + y.toString() +
+            " is not an integer.", y);
+    }
+    return _integerRemainder(x, y);
+};
+
+// Implementation of the hyperbolic functions
+// http://en.wikipedia.org/wiki/Hyperbolic_cosine
+var cosh = function(x) {
+    if (eqv(x, 0)) {
+        return FloatPoint.makeInstance(1.0);
+    }
+    return divide(add(exp(x), exp(negate(x))),
+        2);
+};
+var sinh = function(x) {
+    return divide(subtract(exp(x), exp(negate(x))),
+        2);
+};
+
+var makeComplexPolar = function(r, theta) {
+    // special case: if theta is zero, just return
+    // the scalar.
+    if (eqv(theta, 0)) {
+        return r;
+    }
+    return Complex.makeInstance(multiply(r, cos(theta)),
+        multiply(r, sin(theta)));
+};
+
+var bitwiseAnd = function(...nums) {
+  var jsNums = getJSExactIntegers(...nums);
+  return jsNums.reduce((x, y) => (x & y));
+}
+
+var bitwiseOr = function(...nums) {
+  var jsNums = getJSExactIntegers(...nums);
+  return jsNums.reduce((x, y) => (x | y));
+}
+
+var bitwiseXor = function(...nums) {
+  var jsNums = getJSExactIntegers(...nums);
+  return jsNums.reduce((x, y) => (x ^ y));
+}
+
+var bitwiseNot = function(n) {
+  var jsNum = getJSExactIntegers(n)[0];
+  return ~jsNum;
+}
+
+var arithmeticShift = function(n, m) {
+  [n, m] = getJSExactIntegers(n, m);
+  if (m < 0) {
+    return n >> -m;
+  } else {
+    return n << m;
+  }
+}
+
+//////////////////////////////////////////////////////////////////////
+// Helpers
+
+// IsFinite: scheme-number -> boolean
+// Returns true if the scheme number is finite or not.
+var isSchemeNumberFinite = function(n) {
+    if (typeof(n) === 'number') {
+        return isFinite(n);
+    } else {
+        return n.isFinite();
+    }
+};
+// isOverflow: javascript-number -> boolean
+// Returns true if we consider the number an overflow.
+var MIN_FIXNUM = -(9e15);
+var MAX_FIXNUM = (9e15);
+var isOverflow = function(n) {
+    return (n < MIN_FIXNUM || MAX_FIXNUM < n);
+};
+
+// negate: scheme-number -> scheme-number
+// multiplies a number times -1.
+var negate = function(n) {
+    if (typeof(n) === 'number') {
+        return -n;
+    }
+    return n.negate();
+};
+
+// halve: scheme-number -> scheme-number
+// Divide a number by 2.
+var halve = function(n) {
+    return divide(n, 2);
+};
+
+// timesI: scheme-number scheme-number
+// multiplies a number times i.
+var timesI = function(x) {
+    return multiply(x, plusI);
+};
+
+// fastExpt: computes n^k by squaring.
+// n^k = (n^2)^(k/2)
+// Assumes k is non-negative integer.
+var fastExpt = function(n, k) {
+    var acc = 1;
+    while (true) {
+        if (_integerIsZero(k)) {
+            return acc;
+        }
+        if (equals(modulo(k, 2), 0)) {
+            n = multiply(n, n);
+            k = divide(k, 2);
+        } else {
+            acc = multiply(acc, n);
+            k = subtract(k, 1);
+        }
+    }
+};
+
+// getJSExactIntegers: scheme-number [scheme-number ...] -> [js-number]
+// Get's the underlying JS numbers from one or more scheme exact integers
+// and returns them in an array.
+var getJSExactIntegers = function(...nums) {
+  // Only defined for exact integers.
+  nums.map((x) => {
+    if (!isExactInteger(x)) {
+      throwRuntimeError("Expected exact integer(s).")
+    }
+  })
+
+  // Get the JS value.
+  return nums.map((x) => {
+    if (typeof(x) === 'number') {
+      return x;
+    } else {
+      return x.n;
+    }
+  })
+}
+
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+
+// Integer operations
+// Integers are either represented as fixnums or as BigIntegers.
+// makeIntegerBinop: (fixnum fixnum -> X) (BigInteger BigInteger -> X) -> X
+// Helper to collect the common logic for coersing integer fixnums or bignums to a
+// common type before doing an operation.
+var makeIntegerBinop = function(onFixnums, onBignums, options) {
+    options = options || {};
+    return (function(m, n) {
+        if (m instanceof Rational) {
+            m = numerator(m);
+        } else if (m instanceof Complex) {
+            m = realPart(m);
+        }
+        if (n instanceof Rational) {
+            n = numerator(n);
+        } else if (n instanceof Complex) {
+            n = realPart(n);
+        }
+        if (typeof(m) === 'number' && typeof(n) === 'number') {
+            var result = onFixnums(m, n);
+            if (!isOverflow(result) ||
+                (options.ignoreOverflow)) {
+                return result;
+            }
+        }
+        if (m instanceof FloatPoint || n instanceof FloatPoint) {
+            if (options.doNotCoerseToFloating) {
+                return onFixnums(toFixnum(m), toFixnum(n));
+            } else {
+                return FloatPoint.makeInstance(
+                    onFixnums(toFixnum(m), toFixnum(n)));
+            }
+        }
+        if (typeof(m) === 'number') {
+            m = makeBignum(m);
+        }
+        if (typeof(n) === 'number') {
+            n = makeBignum(n);
+        }
+        return onBignums(m, n);
+    });
+};
+
+var makeIntegerUnOp = function(onFixnums, onBignums, options) {
+    options = options || {};
+    return (function(m) {
+        if (m instanceof Rational) {
+            m = numerator(m);
+        } else if (m instanceof Complex) {
+            m = realPart(m);
+        }
+        if (typeof(m) === 'number') {
+            var result = onFixnums(m);
+            if (!isOverflow(result) ||
+                (options.ignoreOverflow)) {
+                return result;
+            }
+        }
+        if (m instanceof FloatPoint) {
+            return onFixnums(toFixnum(m));
+        }
+        if (typeof(m) === 'number') {
+            m = makeBignum(m);
+        }
+        return onBignums(m);
+    });
+};
+
+// _integerModulo: integer-scheme-number integer-scheme-number -> integer-scheme-number
+var _integerModulo = makeIntegerBinop(
+    function(m, n) {
+        return m % n;
+    },
+    function(m, n) {
+        return bnMod.call(m, n);
+    });
+
+// _integerGcd: integer-scheme-number integer-scheme-number -> integer-scheme-number
+var _integerGcd = makeIntegerBinop(
+    function(a, b) {
+        var t;
+        while (b !== 0) {
+            t = a;
+            a = b;
+            b = t % b;
+        }
+        return a;
+    },
+    function(m, n) {
+        return bnGCD.call(m, n);
+    });
+
+// _integerIsZero: integer-scheme-number -> boolean
+// Returns true if the number is zero.
+var _integerIsZero = makeIntegerUnOp(
+    function(n) {
+        return n === 0;
+    },
+    function(n) {
+        return bnEquals.call(n, BigInteger.ZERO);
+    }
+);
+
+// _integerIsOne: integer-scheme-number -> boolean
+var _integerIsOne = makeIntegerUnOp(
+    function(n) {
+        return n === 1;
+    },
+    function(n) {
+        return bnEquals.call(n, BigInteger.ONE);
+    });
+
+// _integerIsNegativeOne: integer-scheme-number -> boolean
+var _integerIsNegativeOne = makeIntegerUnOp(
+    function(n) {
+        return n === -1;
+    },
+    function(n) {
+        return bnEquals.call(n, BigInteger.NEGATIVE_ONE);
+    });
+
+// _integerAdd: integer-scheme-number integer-scheme-number -> integer-scheme-number
+var _integerAdd = makeIntegerBinop(
+    function(m, n) {
+        return m + n;
+    },
+    function(m, n) {
+        return bnAdd.call(m, n);
+    });
+// _integerSubtract: integer-scheme-number integer-scheme-number -> integer-scheme-number
+var _integerSubtract = makeIntegerBinop(
+    function(m, n) {
+        return m - n;
+    },
+    function(m, n) {
+        return bnSubtract.call(m, n);
+    });
+// _integerMultiply: integer-scheme-number integer-scheme-number -> integer-scheme-number
+var _integerMultiply = makeIntegerBinop(
+    function(m, n) {
+        return m * n;
+    },
+    function(m, n) {
+        return bnMultiply.call(m, n);
+    });
+//_integerQuotient: integer-scheme-number integer-scheme-number -> integer-scheme-number
+var _integerQuotient = makeIntegerBinop(
+    function(m, n) {
+        return ((m - (m % n)) / n);
+    },
+    function(m, n) {
+        return bnDivide.call(m, n);
+    });
+var _integerRemainder = makeIntegerBinop(
+    function(m, n) {
+        return m % n;
+    },
+    function(m, n) {
+        return bnRemainder.call(m, n);
+    });
+
+// _integerDivideToFixnum: integer-scheme-number integer-scheme-number -> fixnum
+var _integerDivideToFixnum = makeIntegerBinop(
+    function(m, n) {
+        return m / n;
+    },
+    function(m, n) {
+        return toFixnum(m) / toFixnum(n);
+    }, {
+        ignoreOverflow: true,
+        doNotCoerseToFloating: true
+    });
+
+// _integerEquals: integer-scheme-number integer-scheme-number -> boolean
+var _integerEquals = makeIntegerBinop(
+    function(m, n) {
+        return m === n;
+    },
+    function(m, n) {
+        return bnEquals.call(m, n);
+    }, {
+        doNotCoerseToFloating: true
+    });
+// _integerGreaterThan: integer-scheme-number integer-scheme-number -> boolean
+var _integerGreaterThan = makeIntegerBinop(
+    function(m, n) {
+        return m > n;
+    },
+    function(m, n) {
+        return bnCompareTo.call(m, n) > 0;
+    }, {
+        doNotCoerseToFloating: true
+    });
+// _integerLessThan: integer-scheme-number integer-scheme-number -> boolean
+var _integerLessThan = makeIntegerBinop(
+    function(m, n) {
+        return m < n;
+    },
+    function(m, n) {
+        return bnCompareTo.call(m, n) < 0;
+    }, {
+        doNotCoerseToFloating: true
+    });
+// _integerGreaterThanOrEqual: integer-scheme-number integer-scheme-number -> boolean
+var _integerGreaterThanOrEqual = makeIntegerBinop(
+    function(m, n) {
+        return m >= n;
+    },
+    function(m, n) {
+        return bnCompareTo.call(m, n) >= 0;
+    }, {
+        doNotCoerseToFloating: true
+    });
+// _integerLessThanOrEqual: integer-scheme-number integer-scheme-number -> boolean
+var _integerLessThanOrEqual = makeIntegerBinop(
+    function(m, n) {
+        return m <= n;
+    },
+    function(m, n) {
+        return bnCompareTo.call(m, n) <= 0;
+    }, {
+        doNotCoerseToFloating: true
+    });
+
+//////////////////////////////////////////////////////////////////////
+// The boxed number types are expected to implement the following
+// interface.
+//
+// toString: -> string
+// level: number
+// liftTo: scheme-number -> scheme-number
+// isFinite: -> boolean
+// isInteger: -> boolean
+// Produce true if this number can be coersed into an integer.
+// isRational: -> boolean
+// Produce true if the number is rational.
+// isReal: -> boolean
+// Produce true if the number is real.
+// isExact: -> boolean
+// Produce true if the number is exact
+// toExact: -> scheme-number
+// Produce an exact number.
+// toFixnum: -> javascript-number
+// Produce a javascript number.
+// greaterThan: scheme-number -> boolean
+// Compare against instance of the same type.
+// greaterThanOrEqual: scheme-number -> boolean
+// Compare against instance of the same type.
+// lessThan: scheme-number -> boolean
+// Compare against instance of the same type.
+// lessThanOrEqual: scheme-number -> boolean
+// Compare against instance of the same type.
+// add: scheme-number -> scheme-number
+// Add with an instance of the same type.
+// subtract: scheme-number -> scheme-number
+// Subtract with an instance of the same type.
+// multiply: scheme-number -> scheme-number
+// Multiply with an instance of the same type.
+// divide: scheme-number -> scheme-number
+// Divide with an instance of the same type.
+// numerator: -> scheme-number
+// Return the numerator.
+// denominator: -> scheme-number
+// Return the denominator.
+// integerSqrt: -> scheme-number
+// Produce the integer square root.
+// sqrt: -> scheme-number
+// Produce the square root.
+// abs: -> scheme-number
+// Produce the absolute value.
+// floor: -> scheme-number
+// Produce the floor.
+// ceiling: -> scheme-number
+// Produce the ceiling.
+// conjugate: -> scheme-number
+// Produce the conjugate.
+// magnitude: -> scheme-number
+// Produce the magnitude.
+// log: -> scheme-number
+// Produce the log.
+// angle: -> scheme-number
+// Produce the angle.
+// atan: -> scheme-number
+// Produce the arc tangent.
+// cos: -> scheme-number
+// Produce the cosine.
+// sin: -> scheme-number
+// Produce the sine.
+// expt: scheme-number -> scheme-number
+// Produce the power to the input.
+// exp: -> scheme-number
+// Produce e raised to the given power.
+// acos: -> scheme-number
+// Produce the arc cosine.
+// asin: -> scheme-number
+// Produce the arc sine.
+// imaginaryPart: -> scheme-number
+// Produce the imaginary part
+// realPart: -> scheme-number
+// Produce the real part.
+// round: -> scheme-number
+// Round to the nearest integer.
+// equals: scheme-number -> boolean
+// Produce true if the given number of the same type is equal.
+
+//////////////////////////////////////////////////////////////////////
+// Rationals
+
+var Rational = function(n, d) {
+    this.n = n;
+    this.d = d;
+};
+
+Rational.prototype.toString = function() {
+    if (_integerIsOne(this.d)) {
+        return this.n.toString() + "";
+    } else {
+        return this.n.toString() + "/" + this.d.toString();
+    }
+};
+
+Rational.prototype.level = 1;
+
+Rational.prototype.liftTo = function(target) {
+    if (target.level === 2)
+        return new FloatPoint(
+            _integerDivideToFixnum(this.n, this.d));
+    if (target.level === 3)
+        return new Complex(this, 0);
+    return throwRuntimeError("invalid level of Number", this, target);
+};
+Rational.prototype.isFinite = function() {
+    return true;
+};
+Rational.prototype.equals = function(other) {
+    return (other instanceof Rational &&
+        _integerEquals(this.n, other.n) &&
+        _integerEquals(this.d, other.d));
+};
+
+Rational.prototype.isInteger = function() {
+    return _integerIsOne(this.d);
+};
+Rational.prototype.isRational = function() {
+    return true;
+};
+Rational.prototype.isReal = function() {
+    return true;
+};
+
+Rational.prototype.add = function(other) {
+    return Rational.makeInstance(_integerAdd(_integerMultiply(this.n, other.d),
+            _integerMultiply(this.d, other.n)),
+        _integerMultiply(this.d, other.d));
+};
+Rational.prototype.subtract = function(other) {
+    return Rational.makeInstance(_integerSubtract(_integerMultiply(this.n, other.d),
+            _integerMultiply(this.d, other.n)),
+        _integerMultiply(this.d, other.d));
+};
+Rational.prototype.negate = function() {
+    return Rational.makeInstance(-this.n, this.d)
+};
+Rational.prototype.multiply = function(other) {
+    return Rational.makeInstance(_integerMultiply(this.n, other.n),
+        _integerMultiply(this.d, other.d));
+};
+Rational.prototype.divide = function(other) {
+    if (_integerIsZero(this.d) || _integerIsZero(other.n)) {
+        throwRuntimeError("/: division by zero", this, other);
+    }
+    return Rational.makeInstance(_integerMultiply(this.n, other.d),
+        _integerMultiply(this.d, other.n));
+};
+
+Rational.prototype.toExact = function() {
+    return this;
+};
+Rational.prototype.toInexact = function() {
+    return FloatPoint.makeInstance(this.toFixnum());
+};
+
+Rational.prototype.isExact = function() {
+    return true;
+};
+Rational.prototype.isInexact = function() {
+    return false;
+};
+
+Rational.prototype.toFixnum = function() {
+    return _integerDivideToFixnum(this.n, this.d);
+};
+Rational.prototype.numerator = function() {
+    return this.n;
+};
+Rational.prototype.denominator = function() {
+    return this.d;
+};
+Rational.prototype.greaterThan = function(other) {
+    return _integerGreaterThan(_integerMultiply(this.n, other.d),
+        _integerMultiply(this.d, other.n));
+};
+Rational.prototype.greaterThanOrEqual = function(other) {
+    return _integerGreaterThanOrEqual(_integerMultiply(this.n, other.d),
+        _integerMultiply(this.d, other.n));
+};
+Rational.prototype.lessThan = function(other) {
+    return _integerLessThan(_integerMultiply(this.n, other.d),
+        _integerMultiply(this.d, other.n));
+};
+Rational.prototype.lessThanOrEqual = function(other) {
+    return _integerLessThanOrEqual(_integerMultiply(this.n, other.d),
+        _integerMultiply(this.d, other.n));
+};
+
+Rational.prototype.integerSqrt = function() {
+    var result = sqrt(this);
+    if (isRational(result)) {
+        return toExact(floor(result));
+    } else if (isReal(result)) {
+        return toExact(floor(result));
+    } else {
+        return Complex.makeInstance(toExact(floor(realPart(result))),
+            toExact(floor(imaginaryPart(result))));
+    }
+};
+
+
+Rational.prototype.sqrt = function() {
+    if (_integerGreaterThanOrEqual(this.n, 0)) {
+        var newN = sqrt(this.n);
+        var newD = sqrt(this.d);
+        if (equals(floor(newN), newN) &&
+            equals(floor(newD), newD)) {
+            return Rational.makeInstance(newN, newD);
+        } else {
+            return FloatPoint.makeInstance(_integerDivideToFixnum(newN, newD));
+        }
+    } else {
+        var newN = sqrt(negate(this.n));
+        var newD = sqrt(this.d);
+        if (equals(floor(newN), newN) &&
+            equals(floor(newD), newD)) {
+            return Complex.makeInstance(
+                0,
+                Rational.makeInstance(newN, newD));
+        } else {
+            return Complex.makeInstance(
+                0,
+                FloatPoint.makeInstance(_integerDivideToFixnum(newN, newD)));
+        }
+    }
+};
+
+Rational.prototype.abs = function() {
+    return Rational.makeInstance(abs(this.n),
+        this.d);
+};
+
+
+Rational.prototype.floor = function() {
+    var quotient = _integerQuotient(this.n, this.d);
+    if (_integerLessThan(this.n, 0)) {
+        return subtract(quotient, 1);
+    } else {
+        return quotient;
+    }
+};
+
+
+Rational.prototype.ceiling = function() {
+    var quotient = _integerQuotient(this.n, this.d);
+    if (_integerLessThan(this.n, 0)) {
+        return quotient;
+    } else {
+        return add(quotient, 1);
+    }
+};
+
+Rational.prototype.conjugate = function() {
+    return this;
+};
+
+Rational.prototype.magnitude = Rational.prototype.abs;
+
+Rational.prototype.log = function() {
+    return FloatPoint.makeInstance(Math.log(this.n / this.d));
+};
+
+Rational.prototype.angle = function() {
+    if (_integerIsZero(this.n))
+        return 0;
+    if (_integerGreaterThan(this.n, 0))
+        return 0;
+    else
+        return FloatPoint.pi;
+};
+
+Rational.prototype.tan = function() {
+    return FloatPoint.makeInstance(Math.tan(_integerDivideToFixnum(this.n, this.d)));
+};
+
+Rational.prototype.atan = function() {
+    return FloatPoint.makeInstance(Math.atan(_integerDivideToFixnum(this.n, this.d)));
+};
+
+Rational.prototype.cos = function() {
+    return FloatPoint.makeInstance(Math.cos(_integerDivideToFixnum(this.n, this.d)));
+};
+
+Rational.prototype.sin = function() {
+    return FloatPoint.makeInstance(Math.sin(_integerDivideToFixnum(this.n, this.d)));
+};
+
+Rational.prototype.expt = function(a) {
+    if (isExactInteger(a) && greaterThanOrEqual(a, 0)) {
+        return fastExpt(this, a);
+    }
+    return FloatPoint.makeInstance(Math.pow(_integerDivideToFixnum(this.n, this.d),
+        _integerDivideToFixnum(a.n, a.d)));
+};
+
+Rational.prototype.exp = function() {
+    return FloatPoint.makeInstance(Math.exp(_integerDivideToFixnum(this.n, this.d)));
+};
+
+Rational.prototype.acos = function() {
+    return FloatPoint.makeInstance(Math.acos(_integerDivideToFixnum(this.n, this.d)));
+};
+
+Rational.prototype.asin = function() {
+    return FloatPoint.makeInstance(Math.asin(_integerDivideToFixnum(this.n, this.d)));
+};
+
+Rational.prototype.imaginaryPart = function() {
+    return 0;
+};
+
+Rational.prototype.realPart = function() {
+    return this;
+};
+
+
+Rational.prototype.round = function() {
+    // FIXME: not correct when values are bignums
+    if (equals(this.d, 2)) {
+        // Round to even if it's a n/2
+        var v = _integerDivideToFixnum(this.n, this.d);
+        var fl = Math.floor(v);
+        var ce = Math.ceil(v);
+        if (_integerIsZero(fl % 2)) {
+            return fl;
+        } else {
+            return ce;
+        }
+    } else {
+        return Math.round(this.n / this.d);
+    }
+};
+
+
+Rational.makeInstance = function(n, d) {
+    if (n === undefined)
+        throwRuntimeError("n undefined", n, d);
+
+    if (d === undefined) {
+        d = 1;
+    }
+
+    if (_integerLessThan(d, 0)) {
+        n = negate(n);
+        d = negate(d);
+    }
+
+    var divisor = _integerGcd(abs(n), abs(d));
+    n = _integerQuotient(n, divisor);
+    d = _integerQuotient(d, divisor);
+
+    // Optimization: if we can get around construction the rational
+    // in favor of just returning n, do it:
+    if (_integerIsOne(d) || _integerIsZero(n)) {
+        return n;
+    }
+
+    return new Rational(n, d);
+};
+
+
+
+// Floating Point numbers
+var FloatPoint = function(n) {
+    this.n = n;
+};
+FloatPoint = FloatPoint;
+
+
+var NaN = new FloatPoint(Number.NaN);
+var inf = new FloatPoint(Number.POSITIVE_INFINITY);
+var neginf = new FloatPoint(Number.NEGATIVE_INFINITY);
+
+// We use these two constants to represent the floating-point coersion
+// of bignums that can't be represented with fidelity.
+var TOO_POSITIVE_TO_REPRESENT = new FloatPoint(Number.POSITIVE_INFINITY);
+var TOO_NEGATIVE_TO_REPRESENT = new FloatPoint(Number.NEGATIVE_INFINITY);
+
+// Negative zero is a distinguished value representing -0.0.
+// There should only be one instance for -0.0.
+var NEGATIVE_ZERO = new FloatPoint(-0.0);
+var INEXACT_ZERO = new FloatPoint(0.0);
+
+FloatPoint.pi = new FloatPoint(Math.PI);
+FloatPoint.e = new FloatPoint(Math.E);
+FloatPoint.nan = NaN;
+FloatPoint.inf = inf;
+FloatPoint.neginf = neginf;
+
+FloatPoint.makeInstance = function(n) {
+    if (isNaN(n)) {
+        return FloatPoint.nan;
+    } else if (n === Number.POSITIVE_INFINITY) {
+        return FloatPoint.inf;
+    } else if (n === Number.NEGATIVE_INFINITY) {
+        return FloatPoint.neginf;
+    } else if (n === 0) {
+        if ((1 / n) === -Infinity) {
+            return NEGATIVE_ZERO;
+        } else {
+            return INEXACT_ZERO;
+        }
+    }
+    return new FloatPoint(n);
+};
+
+
+FloatPoint.prototype.isExact = function() {
+    return false;
+};
+
+FloatPoint.prototype.isInexact = function() {
+    return true;
+};
+
+
+FloatPoint.prototype.isFinite = function() {
+    return (isFinite(this.n) ||
+        this === TOO_POSITIVE_TO_REPRESENT ||
+        this === TOO_NEGATIVE_TO_REPRESENT);
+};
+
+
+FloatPoint.prototype.toExact = function() {
+    // The precision of ieee is about 16 decimal digits, which we use here.
+    if (!isFinite(this.n) || isNaN(this.n)) {
+        throwRuntimeError("toExact: no exact representation for " + this, this);
+    }
+
+    var stringRep = this.n.toString();
+    var match = stringRep.match(/^(.*)\.(.*)$/);
+    if (match) {
+        var intPart = parseInt(match[1]);
+        var fracPart = parseInt(match[2]);
+        var tenToDecimalPlaces = Math.pow(10, match[2].length);
+        return Rational.makeInstance(Math.round(this.n * tenToDecimalPlaces),
+            tenToDecimalPlaces);
+    } else {
+        return this.n;
+    }
+};
+
+FloatPoint.prototype.toInexact = function() {
+    return this;
+};
+
+FloatPoint.prototype.isInexact = function() {
+    return true;
+};
+
+
+FloatPoint.prototype.level = 2;
+
+
+FloatPoint.prototype.liftTo = function(target) {
+    if (target.level === 3)
+        return new Complex(this, 0);
+    return throwRuntimeError("invalid level of Number", this, target);
+};
+
+FloatPoint.prototype.toString = function() {
+    if (isNaN(this.n))
+        return "+nan.0";
+    if (this.n === Number.POSITIVE_INFINITY)
+        return "+inf.0";
+    if (this.n === Number.NEGATIVE_INFINITY)
+        return "-inf.0";
+    if (this === NEGATIVE_ZERO)
+        return "-0.0";
+    var partialResult = this.n.toString();
+    if (!partialResult.match('\\.')) {
+        return partialResult + ".0";
+    } else {
+        return partialResult;
+    }
+};
+
+
+FloatPoint.prototype.equals = function(other, aUnionFind) {
+    return ((other instanceof FloatPoint) &&
+        ((this.n === other.n)));
+};
+
+
+
+FloatPoint.prototype.isRational = function() {
+    return this.isFinite();
+};
+
+FloatPoint.prototype.isInteger = function() {
+    return this.isFinite() && this.n === Math.floor(this.n);
+};
+
+FloatPoint.prototype.isReal = function() {
+    return true;
+};
+
+
+// sign: Number -> {-1, 0, 1}
+var sign = function(n) {
+    if (lessThan(n, 0)) {
+        return -1;
+    } else if (greaterThan(n, 0)) {
+        return 1;
+    } else if (n === NEGATIVE_ZERO) {
+        return -1;
+    } else {
+        return 0;
+    }
+};
+
+
+FloatPoint.prototype.add = function(other) {
+    if (this.isFinite() && other.isFinite()) {
+        return FloatPoint.makeInstance(this.n + other.n);
+    } else {
+        if (isNaN(this.n) || isNaN(other.n)) {
+            return NaN;
+        } else if (this.isFinite() && !other.isFinite()) {
+            return other;
+        } else if (!this.isFinite() && other.isFinite()) {
+            return this;
+        } else {
+            return ((sign(this) * sign(other) === 1) ?
+                this : NaN);
+        };
+    }
+};
+
+FloatPoint.prototype.subtract = function(other) {
+    if (this.isFinite() && other.isFinite()) {
+        return FloatPoint.makeInstance(this.n - other.n);
+    } else if (isNaN(this.n) || isNaN(other.n)) {
+        return NaN;
+    } else if (!this.isFinite() && !other.isFinite()) {
+        if (sign(this) === sign(other)) {
+            return NaN;
+        } else {
+            return this;
+        }
+    } else if (this.isFinite()) {
+        return multiply(other, -1);
+    } else { // other.isFinite()
+        return this;
+    }
+};
+
+
+FloatPoint.prototype.negate = function() {
+    return FloatPoint.makeInstance(-this.n);
+};
+
+FloatPoint.prototype.multiply = function(other) {
+    return FloatPoint.makeInstance(this.n * other.n);
+};
+
+FloatPoint.prototype.divide = function(other) {
+    return FloatPoint.makeInstance(this.n / other.n);
+};
+
+
+FloatPoint.prototype.toFixnum = function() {
+    return this.n;
+};
+
+FloatPoint.prototype.numerator = function() {
+    var stringRep = this.n.toString();
+    var match = stringRep.match(/^(.*)\.(.*)$/);
+    if (match) {
+        var afterDecimal = parseInt(match[2]);
+        var factorToInt = Math.pow(10, match[2].length);
+        var extraFactor = _integerGcd(factorToInt, afterDecimal);
+        var multFactor = factorToInt / extraFactor;
+        return FloatPoint.makeInstance(Math.round(this.n * multFactor));
+    } else {
+        return this;
+    }
+};
+
+FloatPoint.prototype.denominator = function() {
+    var stringRep = this.n.toString();
+    var match = stringRep.match(/^(.*)\.(.*)$/);
+    if (match) {
+        var afterDecimal = parseInt(match[2]);
+        var factorToInt = Math.pow(10, match[2].length);
+        var extraFactor = _integerGcd(factorToInt, afterDecimal);
+        return FloatPoint.makeInstance(Math.round(factorToInt / extraFactor));
+    } else {
+        return FloatPoint.makeInstance(1);
+    }
+};
+
+
+FloatPoint.prototype.floor = function() {
+    return FloatPoint.makeInstance(Math.floor(this.n));
+};
+
+FloatPoint.prototype.ceiling = function() {
+    return FloatPoint.makeInstance(Math.ceil(this.n));
+};
+
+
+FloatPoint.prototype.greaterThan = function(other) {
+    return this.n > other.n;
+};
+
+FloatPoint.prototype.greaterThanOrEqual = function(other) {
+    return this.n >= other.n;
+};
+
+FloatPoint.prototype.lessThan = function(other) {
+    return this.n < other.n;
+};
+
+FloatPoint.prototype.lessThanOrEqual = function(other) {
+    return this.n <= other.n;
+};
+
+
+FloatPoint.prototype.integerSqrt = function() {
+    if (this === NEGATIVE_ZERO) {
+        return this;
+    }
+    if (isInteger(this)) {
+        if (this.n >= 0) {
+            return FloatPoint.makeInstance(Math.floor(Math.sqrt(this.n)));
+        } else {
+            return Complex.makeInstance(
+                INEXACT_ZERO,
+                FloatPoint.makeInstance(Math.floor(Math.sqrt(-this.n))));
+        }
+    } else {
+        throwRuntimeError("integerSqrt: can only be applied to an integer", this);
+    }
+};
+
+FloatPoint.prototype.sqrt = function() {
+    if (this.n < 0) {
+        var result = Complex.makeInstance(
+            0,
+            FloatPoint.makeInstance(Math.sqrt(-this.n)));
+        return result;
+    } else {
+        return FloatPoint.makeInstance(Math.sqrt(this.n));
+    }
+};
+
+FloatPoint.prototype.abs = function() {
+    return FloatPoint.makeInstance(Math.abs(this.n));
+};
+
+
+
+FloatPoint.prototype.log = function() {
+    if (this.n < 0)
+        return (new Complex(this, 0)).log();
+    else
+        return FloatPoint.makeInstance(Math.log(this.n));
+};
+
+FloatPoint.prototype.angle = function() {
+    if (0 === this.n)
+        return 0;
+    if (this.n > 0)
+        return 0;
+    else
+        return FloatPoint.pi;
+};
+
+FloatPoint.prototype.tan = function() {
+    return FloatPoint.makeInstance(Math.tan(this.n));
+};
+
+FloatPoint.prototype.atan = function() {
+    return FloatPoint.makeInstance(Math.atan(this.n));
+};
+
+FloatPoint.prototype.cos = function() {
+    return FloatPoint.makeInstance(Math.cos(this.n));
+};
+
+FloatPoint.prototype.sin = function() {
+    return FloatPoint.makeInstance(Math.sin(this.n));
+};
+
+FloatPoint.prototype.expt = function(a) {
+    if (this.n === 1) {
+        if (a.isFinite()) {
+            return this;
+        } else if (isNaN(a.n)) {
+            return this;
+        } else {
+            return this;
+        }
+    } else {
+        return FloatPoint.makeInstance(Math.pow(this.n, a.n));
+    }
+};
+
+FloatPoint.prototype.exp = function() {
+    return FloatPoint.makeInstance(Math.exp(this.n));
+};
+
+FloatPoint.prototype.acos = function() {
+    return FloatPoint.makeInstance(Math.acos(this.n));
+};
+
+FloatPoint.prototype.asin = function() {
+    return FloatPoint.makeInstance(Math.asin(this.n));
+};
+
+FloatPoint.prototype.imaginaryPart = function() {
+    return 0;
+};
+
+FloatPoint.prototype.realPart = function() {
+    return this;
+};
+
+
+FloatPoint.prototype.round = function() {
+    if (isFinite(this.n)) {
+        if (this === NEGATIVE_ZERO) {
+            return this;
+        }
+        if (Math.abs(Math.floor(this.n) - this.n) === 0.5) {
+            if (Math.floor(this.n) % 2 === 0)
+                return FloatPoint.makeInstance(Math.floor(this.n));
+            return FloatPoint.makeInstance(Math.ceil(this.n));
+        } else {
+            return FloatPoint.makeInstance(Math.round(this.n));
+        }
+    } else {
+        return this;
+    }
+};
+
+
+FloatPoint.prototype.conjugate = function() {
+    return this;
+};
+
+FloatPoint.prototype.magnitude = FloatPoint.prototype.abs;
+
+
+
+//////////////////////////////////////////////////////////////////////
+// Complex numbers
+//////////////////////////////////////////////////////////////////////
+
+var Complex = function(r, i) {
+    this.r = r;
+    this.i = i;
+};
+
+// Constructs a complex number from two basic number r and i.  r and i can
+// either be plt.type.Rational or plt.type.FloatPoint.
+Complex.makeInstance = function(r, i) {
+    if (i === undefined) {
+        i = 0;
+    }
+    if (isExact(i) && isInteger(i) && _integerIsZero(i)) {
+        return r;
+    }
+    if (isInexact(r) || isInexact(i)) {
+        r = toInexact(r);
+        i = toInexact(i);
+    }
+    return new Complex(r, i);
+};
+
+Complex.prototype.toString = function() {
+    var realPart = this.r.toString(),
+        imagPart = this.i.toString();
+    if (imagPart[0] === '-' || imagPart[0] === '+') {
+        return realPart + imagPart + 'i';
+    } else {
+        return realPart + "+" + imagPart + 'i';
+    }
+};
+
+
+Complex.prototype.isFinite = function() {
+    return isSchemeNumberFinite(this.r) && isSchemeNumberFinite(this.i);
+};
+
+
+Complex.prototype.isRational = function() {
+    return isRational(this.r) && eqv(this.i, 0);
+};
+
+Complex.prototype.isInteger = function() {
+    return (isInteger(this.r) &&
+        eqv(this.i, 0));
+};
+
+Complex.prototype.toExact = function() {
+    return Complex.makeInstance(toExact(this.r), toExact(this.i));
+};
+
+Complex.prototype.toInexact = function() {
+    return Complex.makeInstance(toInexact(this.r),
+        toInexact(this.i));
+};
+
+
+Complex.prototype.isExact = function() {
+    return isExact(this.r) && isExact(this.i);
+};
+
+
+Complex.prototype.isInexact = function() {
+    return isInexact(this.r) || isInexact(this.i);
+};
+
+
+Complex.prototype.level = 3;
+
+
+Complex.prototype.liftTo = function(target) {
+    throwRuntimeError("Don't know how to lift Complex number", this, target);
+};
+
+Complex.prototype.equals = function(other) {
+    var result = ((other instanceof Complex) &&
+        (equals(this.r, other.r)) &&
+        (equals(this.i, other.i)));
+    return result;
+};
+
+
+
+Complex.prototype.greaterThan = function(other) {
+    if (!this.isReal() || !other.isReal()) {
+        throwRuntimeError(">: expects argument of type real number", this, other);
+    }
+    return greaterThan(this.r, other.r);
+};
+
+Complex.prototype.greaterThanOrEqual = function(other) {
+    if (!this.isReal() || !other.isReal()) {
+        throwRuntimeError(">=: expects argument of type real number", this, other);
+    }
+    return greaterThanOrEqual(this.r, other.r);
+};
+
+Complex.prototype.lessThan = function(other) {
+    if (!this.isReal() || !other.isReal()) {
+        throwRuntimeError("<: expects argument of type real number", this, other);
+    }
+    return lessThan(this.r, other.r);
+};
+
+Complex.prototype.lessThanOrEqual = function(other) {
+    if (!this.isReal() || !other.isReal()) {
+        throwRuntimeError("<=: expects argument of type real number", this, other);
+    }
+    return lessThanOrEqual(this.r, other.r);
+};
+
+
+Complex.prototype.abs = function() {
+    if (!equals(this.i, 0).valueOf())
+        throwRuntimeError("abs: expects argument of type real number", this);
+    return abs(this.r);
+};
+
+Complex.prototype.toFixnum = function() {
+    if (!equals(this.i, 0).valueOf())
+        throwRuntimeError("toFixnum: expects argument of type real number", this);
+    return toFixnum(this.r);
+};
+
+Complex.prototype.numerator = function() {
+    if (!this.isReal())
+        throwRuntimeError("numerator: can only be applied to real number", this);
+    return numerator(this.n);
+};
+
+
+Complex.prototype.denominator = function() {
+    if (!this.isReal())
+        throwRuntimeError("floor: can only be applied to real number", this);
+    return denominator(this.n);
+};
+
+Complex.prototype.add = function(other) {
+    return Complex.makeInstance(
+        add(this.r, other.r),
+        add(this.i, other.i));
+};
+
+Complex.prototype.subtract = function(other) {
+    return Complex.makeInstance(
+        subtract(this.r, other.r),
+        subtract(this.i, other.i));
+};
+
+Complex.prototype.negate = function() {
+    return Complex.makeInstance(negate(this.r),
+        negate(this.i));
+};
+
+
+Complex.prototype.multiply = function(other) {
+    // If the other value is real, just do primitive division
+    if (other.isReal()) {
+        return Complex.makeInstance(
+            multiply(this.r, other.r),
+            multiply(this.i, other.r));
+    }
+    var r = subtract(
+        multiply(this.r, other.r),
+        multiply(this.i, other.i));
+    var i = add(
+        multiply(this.r, other.i),
+        multiply(this.i, other.r));
+    return Complex.makeInstance(r, i);
+};
+
+
+
+
+
+Complex.prototype.divide = function(other) {
+    var a, b, c, d, r, x, y;
+    // If the other value is real, just do primitive division
+    if (other.isReal()) {
+        return Complex.makeInstance(
+            divide(this.r, other.r),
+            divide(this.i, other.r));
+    }
+
+    if (this.isInexact() || other.isInexact()) {
+        // http://portal.acm.org/citation.cfm?id=1039814
+        // We currently use Smith's method, though we should
+        // probably switch over to Priest's method.
+        a = this.r;
+        b = this.i;
+        c = other.r;
+        d = other.i;
+        if (lessThanOrEqual(abs(d), abs(c))) {
+            r = divide(d, c);
+            x = divide(add(a, multiply(b, r)),
+                add(c, multiply(d, r)));
+            y = divide(subtract(b, multiply(a, r)),
+                add(c, multiply(d, r)));
+        } else {
+            r = divide(c, d);
+            x = divide(add(multiply(a, r), b),
+                add(multiply(c, r), d));
+            y = divide(subtract(multiply(b, r), a),
+                add(multiply(c, r), d));
+        }
+        return Complex.makeInstance(x, y);
+    } else {
+        var con = conjugate(other);
+        var up = multiply(this, con);
+
+        // Down is guaranteed to be real by this point.
+        var down = realPart(multiply(other, con));
+
+        var result = Complex.makeInstance(
+            divide(realPart(up), down),
+            divide(imaginaryPart(up), down));
+        return result;
+    }
+};
+
+Complex.prototype.conjugate = function() {
+    var result = Complex.makeInstance(
+        this.r,
+        subtract(0, this.i));
+
+    return result;
+};
+
+Complex.prototype.magnitude = function() {
+    var sum = add(
+        multiply(this.r, this.r),
+        multiply(this.i, this.i));
+    return sqrt(sum);
+};
+
+Complex.prototype.isReal = function() {
+    return eqv(this.i, 0);
+};
+
+Complex.prototype.integerSqrt = function() {
+    if (isInteger(this)) {
+        return integerSqrt(this.r);
+    } else {
+        throwRuntimeError("integerSqrt: can only be applied to an integer", this);
+    }
+};
+
+Complex.prototype.sqrt = function() {
+    if (this.isReal())
+        return sqrt(this.r);
+    // http://en.wikipedia.org/wiki/Square_root#Square_roots_of_negative_and_complex_numbers
+    var r_plus_x = add(this.magnitude(), this.r);
+
+    var r = sqrt(halve(r_plus_x));
+
+    var i = divide(this.i, sqrt(multiply(r_plus_x, 2)));
+
+
+    return Complex.makeInstance(r, i);
+};
+
+Complex.prototype.log = function() {
+    var m = this.magnitude();
+    var theta = this.angle();
+    var result = add(
+        log(m),
+        timesI(theta));
+    return result;
+};
+
+Complex.prototype.angle = function() {
+    if (this.isReal()) {
+        return angle(this.r);
+    }
+    if (equals(0, this.r)) {
+        var tmp = halve(FloatPoint.pi);
+        return greaterThan(this.i, 0) ?
+            tmp : negate(tmp);
+    } else {
+        var tmp = atan(divide(abs(this.i), abs(this.r)));
+        if (greaterThan(this.r, 0)) {
+            return greaterThan(this.i, 0) ?
+                tmp : negate(tmp);
+        } else {
+            return greaterThan(this.i, 0) ?
+                subtract(FloatPoint.pi, tmp) : subtract(tmp, FloatPoint.pi);
+        }
+    }
+};
+
+var plusI = Complex.makeInstance(0, 1);
+var minusI = Complex.makeInstance(0, -1);
+
+
+Complex.prototype.tan = function() {
+    return divide(this.sin(), this.cos());
+};
+
+Complex.prototype.atan = function() {
+    if (equals(this, plusI) ||
+        equals(this, minusI)) {
+        return neginf;
+    }
+    return multiply(
+        plusI,
+        multiply(
+            FloatPoint.makeInstance(0.5),
+            log(divide(
+                add(plusI, this),
+                add(
+                    plusI,
+                    subtract(0, this))))));
+};
+
+Complex.prototype.cos = function() {
+    if (this.isReal())
+        return cos(this.r);
+    var iz = timesI(this);
+    var iz_negate = negate(iz);
+
+    return halve(add(exp(iz), exp(iz_negate)));
+};
+
+Complex.prototype.sin = function() {
+    if (this.isReal())
+        return sin(this.r);
+    var iz = timesI(this);
+    var iz_negate = negate(iz);
+    var z2 = Complex.makeInstance(0, 2);
+    var exp_negate = subtract(exp(iz), exp(iz_negate));
+    var result = divide(exp_negate, z2);
+    return result;
+};
+
+
+Complex.prototype.expt = function(y) {
+    if (isExactInteger(y) && greaterThanOrEqual(y, 0)) {
+        return fastExpt(this, y);
+    }
+    var expo = multiply(y, this.log());
+    return exp(expo);
+};
+
+Complex.prototype.exp = function() {
+    var r = exp(this.r);
+    var cos_a = cos(this.i);
+    var sin_a = sin(this.i);
+
+    return multiply(
+        r,
+        add(cos_a, timesI(sin_a)));
+};
+
+Complex.prototype.acos = function() {
+    if (this.isReal())
+        return acos(this.r);
+    var pi_half = halve(FloatPoint.pi);
+    var iz = timesI(this);
+    var root = sqrt(subtract(1, sqr(this)));
+    var l = timesI(log(add(iz, root)));
+    return add(pi_half, l);
+};
+
+Complex.prototype.asin = function() {
+    if (this.isReal())
+        return asin(this.r);
+
+    var oneNegateThisSq =
+        subtract(1, sqr(this));
+    var sqrtOneNegateThisSq = sqrt(oneNegateThisSq);
+    return multiply(2, atan(divide(this,
+        add(1, sqrtOneNegateThisSq))));
+};
+
+Complex.prototype.ceiling = function() {
+    if (!this.isReal())
+        throwRuntimeError("ceiling: can only be applied to real number", this);
+    return ceiling(this.r);
+};
+
+Complex.prototype.floor = function() {
+    if (!this.isReal())
+        throwRuntimeError("floor: can only be applied to real number", this);
+    return floor(this.r);
+};
+
+Complex.prototype.imaginaryPart = function() {
+    return this.i;
+};
+
+Complex.prototype.realPart = function() {
+    return this.r;
+};
+
+Complex.prototype.round = function() {
+    if (!this.isReal())
+        throwRuntimeError("round: can only be applied to real number", this);
+    return round(this.r);
+};
+
+
+
+var rationalRegexp = new RegExp("^([+-]?\\d+)/(\\d+)$");
+var complexRegexp = new RegExp("^([+-]?[\\d\\w/\\.]*)([+-])([\\d\\w/\\.]*)i$");
+var digitRegexp = new RegExp("^[+-]?\\d+$");
+var flonumRegexp = new RegExp("^([+-]?\\d*)\\.(\\d*)$");
+var scientificPattern = new RegExp("^([+-]?\\d*\\.?\\d*)[Ee](\\+?\\d+)$");
+
+// fromString: string -> (scheme-number | false)
+var fromString = function(x) {
+    x = x.toString(); // TODO: This can be done better.
+
+    var aMatch = x.match(rationalRegexp);
+    if (aMatch) {
+        return Rational.makeInstance(fromString(aMatch[1]),
+            fromString(aMatch[2]));
+    }
+
+    var cMatch = x.match(complexRegexp);
+    if (cMatch) {
+        return Complex.makeInstance(fromString(cMatch[1] || "0"),
+            fromString(cMatch[2] + (cMatch[3] || "1")));
+    }
+
+    // Floating point tests
+    if (x === '+nan.0' || x === '-nan.0')
+        return FloatPoint.nan;
+    if (x === '+inf.0')
+        return FloatPoint.inf;
+    if (x === '-inf.0')
+        return FloatPoint.neginf;
+    if (x === "-0.0") {
+        return NEGATIVE_ZERO;
+    }
+    if (x.match(flonumRegexp) || x.match(scientificPattern)) {
+        return FloatPoint.makeInstance(Number(x));
+    }
+
+    // Finally, integer tests.
+    if (x.match(digitRegexp)) {
+        var n = Number(x);
+        if (isOverflow(n)) {
+            return makeBignum(x);
+        } else {
+            return n;
+        }
+    } else {
+        return false;
+    }
+};
+
+
+
+
+
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+
+// The code below comes from Tom Wu's BigInteger implementation:
+
+// Copyright (c) 2005  Tom Wu
+// All Rights Reserved.
+// See "LICENSE" for details.
+
+// Basic JavaScript BN library - subset useful for RSA encryption.
+
+// Bits per digit
+var dbits;
+
+// JavaScript engine analysis
+var canary = 0xdeadbeefcafe;
+var j_lm = ((canary & 0xffffff) == 0xefcafe);
+
+// (public) Constructor
+function BigInteger(a, b, c) {
+    if (a != null)
+        if ("number" == typeof a) this.fromNumber(a, b, c);
+        else if (b == null && "string" != typeof a) this.fromString(a, 256);
+    else this.fromString(a, b);
+}
+
+// return new, unset BigInteger
+function nbi() {
+    return new BigInteger(null);
+}
+
+// am: Compute w_j += (x*this_i), propagate carries,
+// c is initial carry, returns final carry.
+// c < 3*dvalue, x < 2*dvalue, this_i < dvalue
+// We need to select the fastest one that works in this environment.
+
+// am1: use a single mult and divide to get the high bits,
+// max digit bits should be 26 because
+// max internal value = 2*dvalue^2-2*dvalue (< 2^53)
+function am1(i, x, w, j, c, n) {
+    while (--n >= 0) {
+        var v = x * this[i++] + w[j] + c;
+        c = Math.floor(v / 0x4000000);
+        w[j++] = v & 0x3ffffff;
+    }
+    return c;
+}
+// am2 avoids a big mult-and-extract completely.
+// Max digit bits should be <= 30 because we do bitwise ops
+// on values up to 2*hdvalue^2-hdvalue-1 (< 2^31)
+function am2(i, x, w, j, c, n) {
+    var xl = x & 0x7fff,
+        xh = x >> 15;
+    while (--n >= 0) {
+        var l = this[i] & 0x7fff;
+        var h = this[i++] >> 15;
+        var m = xh * l + h * xl;
+        l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff);
+        c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30);
+        w[j++] = l & 0x3fffffff;
+    }
+    return c;
+}
+// Alternately, set max digit bits to 28 since some
+// browsers slow down when dealing with 32-bit numbers.
+function am3(i, x, w, j, c, n) {
+    var xl = x & 0x3fff,
+        xh = x >> 14;
+    while (--n >= 0) {
+        var l = this[i] & 0x3fff;
+        var h = this[i++] >> 14;
+        var m = xh * l + h * xl;
+        l = xl * l + ((m & 0x3fff) << 14) + w[j] + c;
+        c = (l >> 28) + (m >> 14) + xh * h;
+        w[j++] = l & 0xfffffff;
+    }
+    return c;
+}
+if (j_lm && (typeof(navigator) !== 'undefined' && navigator.appName == "Microsoft Internet Explorer")) {
+    BigInteger.prototype.am = am2;
+    dbits = 30;
+} else if (j_lm && (typeof(navigator) !== 'undefined' && navigator.appName != "Netscape")) {
+    BigInteger.prototype.am = am1;
+    dbits = 26;
+} else { // Mozilla/Netscape seems to prefer am3
+    BigInteger.prototype.am = am3;
+    dbits = 28;
+}
+
+BigInteger.prototype.DB = dbits;
+BigInteger.prototype.DM = ((1 << dbits) - 1);
+BigInteger.prototype.DV = (1 << dbits);
+
+var BI_FP = 52;
+BigInteger.prototype.FV = Math.pow(2, BI_FP);
+BigInteger.prototype.F1 = BI_FP - dbits;
+BigInteger.prototype.F2 = 2 * dbits - BI_FP;
+
+// Digit conversions
+var BI_RM = "0123456789abcdefghijklmnopqrstuvwxyz";
+var BI_RC = [];
+var rr, vv;
+rr = "0".charCodeAt(0);
+for (vv = 0; vv <= 9; ++vv) BI_RC[rr++] = vv;
+rr = "a".charCodeAt(0);
+for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv;
+rr = "A".charCodeAt(0);
+for (vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv;
+
+function int2char(n) {
+    return BI_RM.charAt(n);
+}
+
+function intAt(s, i) {
+    var c = BI_RC[s.charCodeAt(i)];
+    return (c == null) ? -1 : c;
+}
+
+// (protected) copy this to r
+function bnpCopyTo(r) {
+    for (var i = this.t - 1; i >= 0; --i) r[i] = this[i];
+    r.t = this.t;
+    r.s = this.s;
+}
+
+// (protected) set from integer value x, -DV <= x < DV
+function bnpFromInt(x) {
+    this.t = 1;
+    this.s = (x < 0) ? -1 : 0;
+    if (x > 0) this[0] = x;
+    else if (x < -1) this[0] = x + DV;
+    else this.t = 0;
+}
+
+// return bigint initialized to value
+function nbv(i) {
+    var r = nbi();
+    r.fromInt(i);
+    return r;
+}
+
+// (protected) set from string and radix
+function bnpFromString(s, b) {
+    var k;
+    if (b == 16) k = 4;
+    else if (b == 8) k = 3;
+    else if (b == 256) k = 8; // byte array
+    else if (b == 2) k = 1;
+    else if (b == 32) k = 5;
+    else if (b == 4) k = 2;
+    else {
+        this.fromRadix(s, b);
+        return;
+    }
+    this.t = 0;
+    this.s = 0;
+    var i = s.length,
+        mi = false,
+        sh = 0;
+    while (--i >= 0) {
+        var x = (k == 8) ? s[i] & 0xff : intAt(s, i);
+        if (x < 0) {
+            if (s.charAt(i) == "-") mi = true;
+            continue;
+        }
+        mi = false;
+        if (sh == 0)
+            this[this.t++] = x;
+        else if (sh + k > this.DB) {
+            this[this.t - 1] |= (x & ((1 << (this.DB - sh)) - 1)) << sh;
+            this[this.t++] = (x >> (this.DB - sh));
+        } else
+            this[this.t - 1] |= x << sh;
+        sh += k;
+        if (sh >= this.DB) sh -= this.DB;
+    }
+    if (k == 8 && (s[0] & 0x80) != 0) {
+        this.s = -1;
+        if (sh > 0) this[this.t - 1] |= ((1 << (this.DB - sh)) - 1) << sh;
+    }
+    this.clamp();
+    if (mi) BigInteger.ZERO.subTo(this, this);
+}
+
+// (protected) clamp off excess high words
+function bnpClamp() {
+    var c = this.s & this.DM;
+    while (this.t > 0 && this[this.t - 1] == c) --this.t;
+}
+
+// (public) return string representation in given radix
+function bnToString(b) {
+    if (this.s < 0) return "-" + this.negate().toString(b);
+    var k;
+    if (b == 16) k = 4;
+    else if (b == 8) k = 3;
+    else if (b == 2) k = 1;
+    else if (b == 32) k = 5;
+    else if (b == 4) k = 2;
+    else return this.toRadix(b);
+    var km = (1 << k) - 1,
+        d, m = false,
+        r = [],
+        i = this.t;
+    var p = this.DB - (i * this.DB) % k;
+    if (i-- > 0) {
+        if (p < this.DB && (d = this[i] >> p) > 0) {
+            m = true;
+            r.push(int2char(d));
+        }
+        while (i >= 0) {
+            if (p < k) {
+                d = (this[i] & ((1 << p) - 1)) << (k - p);
+                d |= this[--i] >> (p += this.DB - k);
+            } else {
+                d = (this[i] >> (p -= k)) & km;
+                if (p <= 0) {
+                    p += this.DB;
+                    --i;
+                }
+            }
+            if (d > 0) m = true;
+            if (m) r.push(int2char(d));
+        }
+    }
+    return m ? r.join("") : "0";
+}
+
+// (public) -this
+function bnNegate() {
+    var r = nbi();
+    BigInteger.ZERO.subTo(this, r);
+    return r;
+}
+
+// (public) |this|
+function bnAbs() {
+    return (this.s < 0) ? this.negate() : this;
+}
+
+// (public) return + if this > a, - if this < a, 0 if equal
+function bnCompareTo(a) {
+    var r = this.s - a.s;
+    if (r != 0) return r;
+    var i = this.t;
+    if (this.s < 0) {
+        r = a.t - i;
+    } else {
+        r = i - a.t;
+    }
+    if (r != 0) return r;
+    while (--i >= 0)
+        if ((r = this[i] - a[i]) != 0) return r;
+    return 0;
+}
+
+// returns bit length of the integer x
+function nbits(x) {
+    var r = 1,
+        t;
+    if ((t = x >>> 16) != 0) {
+        x = t;
+        r += 16;
+    }
+    if ((t = x >> 8) != 0) {
+        x = t;
+        r += 8;
+    }
+    if ((t = x >> 4) != 0) {
+        x = t;
+        r += 4;
+    }
+    if ((t = x >> 2) != 0) {
+        x = t;
+        r += 2;
+    }
+    if ((t = x >> 1) != 0) {
+        x = t;
+        r += 1;
+    }
+    return r;
+}
+
+// (public) return the number of bits in "this"
+function bnBitLength() {
+    if (this.t <= 0) return 0;
+    return this.DB * (this.t - 1) + nbits(this[this.t - 1] ^ (this.s & this.DM));
+}
+
+// (protected) r = this << n*DB
+function bnpDLShiftTo(n, r) {
+    var i;
+    for (i = this.t - 1; i >= 0; --i) r[i + n] = this[i];
+    for (i = n - 1; i >= 0; --i) r[i] = 0;
+    r.t = this.t + n;
+    r.s = this.s;
+}
+
+// (protected) r = this >> n*DB
+function bnpDRShiftTo(n, r) {
+    for (var i = n; i < this.t; ++i) r[i - n] = this[i];
+    r.t = Math.max(this.t - n, 0);
+    r.s = this.s;
+}
+
+// (protected) r = this << n
+function bnpLShiftTo(n, r) {
+    var bs = n % this.DB;
+    var cbs = this.DB - bs;
+    var bm = (1 << cbs) - 1;
+    var ds = Math.floor(n / this.DB),
+        c = (this.s << bs) & this.DM,
+        i;
+    for (i = this.t - 1; i >= 0; --i) {
+        r[i + ds + 1] = (this[i] >> cbs) | c;
+        c = (this[i] & bm) << bs;
+    }
+    for (i = ds - 1; i >= 0; --i) r[i] = 0;
+    r[ds] = c;
+    r.t = this.t + ds + 1;
+    r.s = this.s;
+    r.clamp();
+}
+
+// (protected) r = this >> n
+function bnpRShiftTo(n, r) {
+    r.s = this.s;
+    var ds = Math.floor(n / this.DB);
+    if (ds >= this.t) {
+        r.t = 0;
+        return;
+    }
+    var bs = n % this.DB;
+    var cbs = this.DB - bs;
+    var bm = (1 << bs) - 1;
+    r[0] = this[ds] >> bs;
+    for (var i = ds + 1; i < this.t; ++i) {
+        r[i - ds - 1] |= (this[i] & bm) << cbs;
+        r[i - ds] = this[i] >> bs;
+    }
+    if (bs > 0) r[this.t - ds - 1] |= (this.s & bm) << cbs;
+    r.t = this.t - ds;
+    r.clamp();
+}
+
+// (protected) r = this - a
+function bnpSubTo(a, r) {
+    var i = 0,
+        c = 0,
+        m = Math.min(a.t, this.t);
+    while (i < m) {
+        c += this[i] - a[i];
+        r[i++] = c & this.DM;
+        c >>= this.DB;
+    }
+    if (a.t < this.t) {
+        c -= a.s;
+        while (i < this.t) {
+            c += this[i];
+            r[i++] = c & this.DM;
+            c >>= this.DB;
+        }
+        c += this.s;
+    } else {
+        c += this.s;
+        while (i < a.t) {
+            c -= a[i];
+            r[i++] = c & this.DM;
+            c >>= this.DB;
+        }
+        c -= a.s;
+    }
+    r.s = (c < 0) ? -1 : 0;
+    if (c < -1) r[i++] = this.DV + c;
+    else if (c > 0) r[i++] = c;
+    r.t = i;
+    r.clamp();
+}
+
+// (protected) r = this * a, r != this,a (HAC 14.12)
+// "this" should be the larger one if appropriate.
+function bnpMultiplyTo(a, r) {
+    var x = this.abs(),
+        y = a.abs();
+    var i = x.t;
+    r.t = i + y.t;
+    while (--i >= 0) r[i] = 0;
+    for (i = 0; i < y.t; ++i) r[i + x.t] = x.am(0, y[i], r, i, 0, x.t);
+    r.s = 0;
+    r.clamp();
+    if (this.s != a.s) BigInteger.ZERO.subTo(r, r);
+}
+
+// (protected) r = this^2, r != this (HAC 14.16)
+function bnpSquareTo(r) {
+    var x = this.abs();
+    var i = r.t = 2 * x.t;
+    while (--i >= 0) r[i] = 0;
+    for (i = 0; i < x.t - 1; ++i) {
+        var c = x.am(i, x[i], r, 2 * i, 0, 1);
+        if ((r[i + x.t] += x.am(i + 1, 2 * x[i], r, 2 * i + 1, c, x.t - i - 1)) >= x.DV) {
+            r[i + x.t] -= x.DV;
+            r[i + x.t + 1] = 1;
+        }
+    }
+    if (r.t > 0) r[r.t - 1] += x.am(i, x[i], r, 2 * i, 0, 1);
+    r.s = 0;
+    r.clamp();
+}
+
+
+// (protected) divide this by m, quotient and remainder to q, r (HAC 14.20)
+// r != q, this != m.  q or r may be null.
+function bnpDivRemTo(m, q, r) {
+    var pm = m.abs();
+    if (pm.t <= 0) return;
+    var pt = this.abs();
+    if (pt.t < pm.t) {
+        if (q != null) q.fromInt(0);
+        if (r != null) this.copyTo(r);
+        return;
+    }
+    if (r == null) r = nbi();
+    var y = nbi(),
+        ts = this.s,
+        ms = m.s;
+    var nsh = this.DB - nbits(pm[pm.t - 1]); // normalize modulus
+    if (nsh > 0) {
+        pm.lShiftTo(nsh, y);
+        pt.lShiftTo(nsh, r);
+    } else {
+        pm.copyTo(y);
+        pt.copyTo(r);
+    }
+    var ys = y.t;
+    var y0 = y[ys - 1];
+    if (y0 == 0) return;
+    var yt = y0 * (1 << this.F1) + ((ys > 1) ? y[ys - 2] >> this.F2 : 0);
+    var d1 = this.FV / yt,
+        d2 = (1 << this.F1) / yt,
+        e = 1 << this.F2;
+    var i = r.t,
+        j = i - ys,
+        t = (q == null) ? nbi() : q;
+    y.dlShiftTo(j, t);
+    if (r.compareTo(t) >= 0) {
+        r[r.t++] = 1;
+        r.subTo(t, r);
+    }
+    BigInteger.ONE.dlShiftTo(ys, t);
+    t.subTo(y, y); // "negative" y so we can replace sub with am later
+    while (y.t < ys) y[y.t++] = 0;
+    while (--j >= 0) {
+        // Estimate quotient digit
+        var qd = (r[--i] == y0) ? this.DM : Math.floor(r[i] * d1 + (r[i - 1] + e) * d2);
+        if ((r[i] += y.am(0, qd, r, j, 0, ys)) < qd) { // Try it out
+            y.dlShiftTo(j, t);
+            r.subTo(t, r);
+            while (r[i] < --qd) r.subTo(t, r);
+        }
+    }
+    if (q != null) {
+        r.drShiftTo(ys, q);
+        if (ts != ms) BigInteger.ZERO.subTo(q, q);
+    }
+    r.t = ys;
+    r.clamp();
+    if (nsh > 0) r.rShiftTo(nsh, r); // Denormalize remainder
+    if (ts < 0) BigInteger.ZERO.subTo(r, r);
+}
+
+// (public) this mod a
+function bnMod(a) {
+    var r = nbi();
+    this.abs().divRemTo(a, null, r);
+    if (this.s < 0 && r.compareTo(BigInteger.ZERO) > 0) a.subTo(r, r);
+    return r;
+}
+
+// Modular reduction using "classic" algorithm
+function Classic(m) {
+    this.m = m;
+}
+
+function cConvert(x) {
+    if (x.s < 0 || x.compareTo(this.m) >= 0) return x.mod(this.m);
+    else return x;
+}
+
+function cRevert(x) {
+    return x;
+}
+
+function cReduce(x) {
+    x.divRemTo(this.m, null, x);
+}
+
+function cMulTo(x, y, r) {
+    x.multiplyTo(y, r);
+    this.reduce(r);
+}
+
+function cSqrTo(x, r) {
+    x.squareTo(r);
+    this.reduce(r);
+}
+
+Classic.prototype.convert = cConvert;
+Classic.prototype.revert = cRevert;
+Classic.prototype.reduce = cReduce;
+Classic.prototype.mulTo = cMulTo;
+Classic.prototype.sqrTo = cSqrTo;
+
+// (protected) return "-1/this % 2^DB"; useful for Mont. reduction
+// justification:
+//         xy == 1 (mod m)
+//         xy =  1+km
+//   xy(2-xy) = (1+km)(1-km)
+// x[y(2-xy)] = 1-k^2m^2
+// x[y(2-xy)] == 1 (mod m^2)
+// if y is 1/x mod m, then y(2-xy) is 1/x mod m^2
+// should reduce x and y(2-xy) by m^2 at each step to keep size bounded.
+// JS multiply "overflows" differently from C/C++, so care is needed here.
+function bnpInvDigit() {
+    if (this.t < 1) return 0;
+    var x = this[0];
+    if ((x & 1) == 0) return 0;
+    var y = x & 3; // y == 1/x mod 2^2
+    y = (y * (2 - (x & 0xf) * y)) & 0xf; // y == 1/x mod 2^4
+    y = (y * (2 - (x & 0xff) * y)) & 0xff; // y == 1/x mod 2^8
+    y = (y * (2 - (((x & 0xffff) * y) & 0xffff))) & 0xffff; // y == 1/x mod 2^16
+    // last step - calculate inverse mod DV directly;
+    // assumes 16 < DB <= 32 and assumes ability to handle 48-bit ints
+    y = (y * (2 - x * y % this.DV)) % this.DV; // y == 1/x mod 2^dbits
+    // we really want the negative inverse, and -DV < y < DV
+    return (y > 0) ? this.DV - y : -y;
+}
+
+// Montgomery reduction
+function Montgomery(m) {
+    this.m = m;
+    this.mp = m.invDigit();
+    this.mpl = this.mp & 0x7fff;
+    this.mph = this.mp >> 15;
+    this.um = (1 << (m.DB - 15)) - 1;
+    this.mt2 = 2 * m.t;
+}
+
+// xR mod m
+function montConvert(x) {
+    var r = nbi();
+    x.abs().dlShiftTo(this.m.t, r);
+    r.divRemTo(this.m, null, r);
+    if (x.s < 0 && r.compareTo(BigInteger.ZERO) > 0) this.m.subTo(r, r);
+    return r;
+}
+
+// x/R mod m
+function montRevert(x) {
+    var r = nbi();
+    x.copyTo(r);
+    this.reduce(r);
+    return r;
+}
+
+// x = x/R mod m (HAC 14.32)
+function montReduce(x) {
+    while (x.t <= this.mt2) // pad x so am has enough room later
+        x[x.t++] = 0;
+    for (var i = 0; i < this.m.t; ++i) {
+        // faster way of calculating u0 = x[i]*mp mod DV
+        var j = x[i] & 0x7fff;
+        var u0 = (j * this.mpl + (((j * this.mph + (x[i] >> 15) * this.mpl) & this.um) << 15)) & x.DM;
+        // use am to combine the multiply-shift-add into one call
+        j = i + this.m.t;
+        x[j] += this.m.am(0, u0, x, i, 0, this.m.t);
+        // propagate carry
+        while (x[j] >= x.DV) {
+            x[j] -= x.DV;
+            x[++j]++;
+        }
+    }
+    x.clamp();
+    x.drShiftTo(this.m.t, x);
+    if (x.compareTo(this.m) >= 0) x.subTo(this.m, x);
+}
+
+// r = "x^2/R mod m"; x != r
+function montSqrTo(x, r) {
+    x.squareTo(r);
+    this.reduce(r);
+}
+
+// r = "xy/R mod m"; x,y != r
+function montMulTo(x, y, r) {
+    x.multiplyTo(y, r);
+    this.reduce(r);
+}
+
+Montgomery.prototype.convert = montConvert;
+Montgomery.prototype.revert = montRevert;
+Montgomery.prototype.reduce = montReduce;
+Montgomery.prototype.mulTo = montMulTo;
+Montgomery.prototype.sqrTo = montSqrTo;
+
+// (protected) true iff this is even
+function bnpIsEven() {
+    return ((this.t > 0) ? (this[0] & 1) : this.s) == 0;
+}
+
+// (protected) this^e, e < 2^32, doing sqr and mul with "r" (HAC 14.79)
+function bnpExp(e, z) {
+    if (e > 0xffffffff || e < 1) return BigInteger.ONE;
+    var r = nbi(),
+        r2 = nbi(),
+        g = z.convert(this),
+        i = nbits(e) - 1;
+    g.copyTo(r);
+    while (--i >= 0) {
+        z.sqrTo(r, r2);
+        if ((e & (1 << i)) > 0) z.mulTo(r2, g, r);
+        else {
+            var t = r;
+            r = r2;
+            r2 = t;
+        }
+    }
+    return z.revert(r);
+}
+
+// (public) this^e % m, 0 <= e < 2^32
+function bnModPowInt(e, m) {
+    var z;
+    if (e < 256 || m.isEven()) z = new Classic(m);
+    else z = new Montgomery(m);
+    return this.exp(e, z);
+}
+
+// protected
+BigInteger.prototype.copyTo = bnpCopyTo;
+BigInteger.prototype.fromInt = bnpFromInt;
+BigInteger.prototype.fromString = bnpFromString;
+BigInteger.prototype.clamp = bnpClamp;
+BigInteger.prototype.dlShiftTo = bnpDLShiftTo;
+BigInteger.prototype.drShiftTo = bnpDRShiftTo;
+BigInteger.prototype.lShiftTo = bnpLShiftTo;
+BigInteger.prototype.rShiftTo = bnpRShiftTo;
+BigInteger.prototype.subTo = bnpSubTo;
+BigInteger.prototype.multiplyTo = bnpMultiplyTo;
+BigInteger.prototype.squareTo = bnpSquareTo;
+BigInteger.prototype.divRemTo = bnpDivRemTo;
+BigInteger.prototype.invDigit = bnpInvDigit;
+BigInteger.prototype.isEven = bnpIsEven;
+BigInteger.prototype.exp = bnpExp;
+
+// public
+BigInteger.prototype.toString = bnToString;
+BigInteger.prototype.negate = bnNegate;
+BigInteger.prototype.abs = bnAbs;
+BigInteger.prototype.compareTo = bnCompareTo;
+BigInteger.prototype.bitLength = bnBitLength;
+BigInteger.prototype.mod = bnMod;
+BigInteger.prototype.modPowInt = bnModPowInt;
+
+// "constants"
+BigInteger.ZERO = nbv(0);
+BigInteger.ONE = nbv(1);
+
+// Copyright (c) 2005-2009  Tom Wu
+// All Rights Reserved.
+// See "LICENSE" for details.
+
+// Extended JavaScript BN functions, required for RSA private ops.
+
+// Version 1.1: new BigInteger("0", 10) returns "proper" zero
+
+// (public)
+function bnClone() {
+    var r = nbi();
+    this.copyTo(r);
+    return r;
+}
+
+// (public) return value as integer
+function bnIntValue() {
+    if (this.s < 0) {
+        if (this.t == 1) return this[0] - this.DV;
+        else if (this.t == 0) return -1;
+    } else if (this.t == 1) return this[0];
+    else if (this.t == 0) return 0;
+    // assumes 16 < DB < 32
+    return ((this[1] & ((1 << (32 - this.DB)) - 1)) << this.DB) | this[0];
+}
+
+// (public) return value as byte
+function bnByteValue() {
+    return (this.t == 0) ? this.s : (this[0] << 24) >> 24;
+}
+
+// (public) return value as short (assumes DB>=16)
+function bnShortValue() {
+    return (this.t == 0) ? this.s : (this[0] << 16) >> 16;
+}
+
+// (protected) return x s.t. r^x < DV
+function bnpChunkSize(r) {
+    return Math.floor(Math.LN2 * this.DB / Math.log(r));
+}
+
+// (public) 0 if this == 0, 1 if this > 0
+function bnSigNum() {
+    if (this.s < 0) return -1;
+    else if (this.t <= 0 || (this.t == 1 && this[0] <= 0)) return 0;
+    else return 1;
+}
+
+// (protected) convert to radix string
+function bnpToRadix(b) {
+    if (b == null) b = 10;
+    if (this.signum() == 0 || b < 2 || b > 36) return "0";
+    var cs = this.chunkSize(b);
+    var a = Math.pow(b, cs);
+    var d = nbv(a),
+        y = nbi(),
+        z = nbi(),
+        r = "";
+    this.divRemTo(d, y, z);
+    while (y.signum() > 0) {
+        r = (a + z.intValue()).toString(b).substr(1) + r;
+        y.divRemTo(d, y, z);
+    }
+    return z.intValue().toString(b) + r;
+}
+
+// (protected) convert from radix string
+function bnpFromRadix(s, b) {
+    this.fromInt(0);
+    if (b == null) b = 10;
+    var cs = this.chunkSize(b);
+    var d = Math.pow(b, cs),
+        mi = false,
+        j = 0,
+        w = 0;
+    for (var i = 0; i < s.length; ++i) {
+        var x = intAt(s, i);
+        if (x < 0) {
+            if (s.charAt(i) == "-" && this.signum() == 0) mi = true;
+            continue;
+        }
+        w = b * w + x;
+        if (++j >= cs) {
+            this.dMultiply(d);
+            this.dAddOffset(w, 0);
+            j = 0;
+            w = 0;
+        }
+    }
+    if (j > 0) {
+        this.dMultiply(Math.pow(b, j));
+        this.dAddOffset(w, 0);
+    }
+    if (mi) BigInteger.ZERO.subTo(this, this);
+}
+
+// (protected) alternate constructor
+function bnpFromNumber(a, b, c) {
+    if ("number" == typeof b) {
+        // new BigInteger(int,int,RNG)
+        if (a < 2) this.fromInt(1);
+        else {
+            this.fromNumber(a, c);
+            if (!this.testBit(a - 1)) // force MSB set
+                this.bitwiseTo(BigInteger.ONE.shiftLeft(a - 1), op_or, this);
+            if (this.isEven()) this.dAddOffset(1, 0); // force odd
+            while (!this.isProbablePrime(b)) {
+                this.dAddOffset(2, 0);
+                if (this.bitLength() > a) this.subTo(BigInteger.ONE.shiftLeft(a - 1), this);
+            }
+        }
+    } else {
+        // new BigInteger(int,RNG)
+        var x = [],
+            t = a & 7;
+        x.length = (a >> 3) + 1;
+        b.nextBytes(x);
+        if (t > 0) x[0] &= ((1 << t) - 1);
+        else x[0] = 0;
+        this.fromString(x, 256);
+    }
+}
+
+// (public) convert to bigendian byte array
+function bnToByteArray() {
+    var i = this.t,
+        r = [];
+    r[0] = this.s;
+    var p = this.DB - (i * this.DB) % 8,
+        d, k = 0;
+    if (i-- > 0) {
+        if (p < this.DB && (d = this[i] >> p) != (this.s & this.DM) >> p)
+            r[k++] = d | (this.s << (this.DB - p));
+        while (i >= 0) {
+            if (p < 8) {
+                d = (this[i] & ((1 << p) - 1)) << (8 - p);
+                d |= this[--i] >> (p += this.DB - 8);
+            } else {
+                d = (this[i] >> (p -= 8)) & 0xff;
+                if (p <= 0) {
+                    p += this.DB;
+                    --i;
+                }
+            }
+            if ((d & 0x80) != 0) d |= -256;
+            if (k == 0 && (this.s & 0x80) != (d & 0x80)) ++k;
+            if (k > 0 || d != this.s) r[k++] = d;
+        }
+    }
+    return r;
+}
+
+function bnEquals(a) {
+    return (this.compareTo(a) == 0);
+}
+
+function bnMin(a) {
+    return (this.compareTo(a) < 0) ? this : a;
+}
+
+function bnMax(a) {
+    return (this.compareTo(a) > 0) ? this : a;
+}
+
+// (protected) r = this op a (bitwise)
+function bnpBitwiseTo(a, op, r) {
+    var i, f, m = Math.min(a.t, this.t);
+    for (i = 0; i < m; ++i) r[i] = op(this[i], a[i]);
+    if (a.t < this.t) {
+        f = a.s & this.DM;
+        for (i = m; i < this.t; ++i) r[i] = op(this[i], f);
+        r.t = this.t;
+    } else {
+        f = this.s & this.DM;
+        for (i = m; i < a.t; ++i) r[i] = op(f, a[i]);
+        r.t = a.t;
+    }
+    r.s = op(this.s, a.s);
+    r.clamp();
+}
+
+// (public) this & a
+function op_and(x, y) {
+    return x & y;
+}
+
+function bnAnd(a) {
+    var r = nbi();
+    this.bitwiseTo(a, op_and, r);
+    return r;
+}
+
+// (public) this | a
+function op_or(x, y) {
+    return x | y;
+}
+
+function bnOr(a) {
+    var r = nbi();
+    this.bitwiseTo(a, op_or, r);
+    return r;
+}
+
+// (public) this ^ a
+function op_xor(x, y) {
+    return x ^ y;
+}
+
+function bnXor(a) {
+    var r = nbi();
+    this.bitwiseTo(a, op_xor, r);
+    return r;
+}
+
+// (public) this & ~a
+function op_andnot(x, y) {
+    return x & ~y;
+}
+
+function bnAndNot(a) {
+    var r = nbi();
+    this.bitwiseTo(a, op_andnot, r);
+    return r;
+}
+
+// (public) ~this
+function bnNot() {
+    var r = nbi();
+    for (var i = 0; i < this.t; ++i) r[i] = this.DM & ~this[i];
+    r.t = this.t;
+    r.s = ~this.s;
+    return r;
+}
+
+// (public) this << n
+function bnShiftLeft(n) {
+    var r = nbi();
+    if (n < 0) this.rShiftTo(-n, r);
+    else this.lShiftTo(n, r);
+    return r;
+}
+
+// (public) this >> n
+function bnShiftRight(n) {
+    var r = nbi();
+    if (n < 0) this.lShiftTo(-n, r);
+    else this.rShiftTo(n, r);
+    return r;
+}
+
+// return index of lowest 1-bit in x, x < 2^31
+function lbit(x) {
+    if (x == 0) return -1;
+    var r = 0;
+    if ((x & 0xffff) == 0) {
+        x >>= 16;
+        r += 16;
+    }
+    if ((x & 0xff) == 0) {
+        x >>= 8;
+        r += 8;
+    }
+    if ((x & 0xf) == 0) {
+        x >>= 4;
+        r += 4;
+    }
+    if ((x & 3) == 0) {
+        x >>= 2;
+        r += 2;
+    }
+    if ((x & 1) == 0) ++r;
+    return r;
+}
+
+// (public) returns index of lowest 1-bit (or -1 if none)
+function bnGetLowestSetBit() {
+    for (var i = 0; i < this.t; ++i)
+        if (this[i] != 0) return i * this.DB + lbit(this[i]);
+    if (this.s < 0) return this.t * this.DB;
+    return -1;
+}
+
+// return number of 1 bits in x
+function cbit(x) {
+    var r = 0;
+    while (x != 0) {
+        x &= x - 1;
+        ++r;
+    }
+    return r;
+}
+
+// (public) return number of set bits
+function bnBitCount() {
+    var r = 0,
+        x = this.s & this.DM;
+    for (var i = 0; i < this.t; ++i) r += cbit(this[i] ^ x);
+    return r;
+}
+
+// (public) true iff nth bit is set
+function bnTestBit(n) {
+    var j = Math.floor(n / this.DB);
+    if (j >= this.t) return (this.s != 0);
+    return ((this[j] & (1 << (n % this.DB))) != 0);
+}
+
+// (protected) this op (1<<n)
+function bnpChangeBit(n, op) {
+    var r = BigInteger.ONE.shiftLeft(n);
+    this.bitwiseTo(r, op, r);
+    return r;
+}
+
+// (public) this | (1<<n)
+function bnSetBit(n) {
+    return this.changeBit(n, op_or);
+}
+
+// (public) this & ~(1<<n)
+function bnClearBit(n) {
+    return this.changeBit(n, op_andnot);
+}
+
+// (public) this ^ (1<<n)
+function bnFlipBit(n) {
+    return this.changeBit(n, op_xor);
+}
+
+// (protected) r = this + a
+function bnpAddTo(a, r) {
+    var i = 0,
+        c = 0,
+        m = Math.min(a.t, this.t);
+    while (i < m) {
+        c += this[i] + a[i];
+        r[i++] = c & this.DM;
+        c >>= this.DB;
+    }
+    if (a.t < this.t) {
+        c += a.s;
+        while (i < this.t) {
+            c += this[i];
+            r[i++] = c & this.DM;
+            c >>= this.DB;
+        }
+        c += this.s;
+    } else {
+        c += this.s;
+        while (i < a.t) {
+            c += a[i];
+            r[i++] = c & this.DM;
+            c >>= this.DB;
+        }
+        c += a.s;
+    }
+    r.s = (c < 0) ? -1 : 0;
+    if (c > 0) r[i++] = c;
+    else if (c < -1) r[i++] = this.DV + c;
+    r.t = i;
+    r.clamp();
+}
+
+// (public) this + a
+function bnAdd(a) {
+    var r = nbi();
+    this.addTo(a, r);
+    return r;
+}
+
+// (public) this - a
+function bnSubtract(a) {
+    var r = nbi();
+    this.subTo(a, r);
+    return r;
+}
+
+// (public) this * a
+function bnMultiply(a) {
+    var r = nbi();
+    this.multiplyTo(a, r);
+    return r;
+}
+
+// (public) this / a
+function bnDivide(a) {
+    var r = nbi();
+    this.divRemTo(a, r, null);
+    return r;
+}
+
+// (public) this % a
+function bnRemainder(a) {
+    var r = nbi();
+    this.divRemTo(a, null, r);
+    return r;
+}
+
+// (public) [this/a,this%a]
+function bnDivideAndRemainder(a) {
+    var q = nbi(),
+        r = nbi();
+    this.divRemTo(a, q, r);
+    return [q, r];
+}
+
+// (protected) this *= n, this >= 0, 1 < n < DV
+function bnpDMultiply(n) {
+    this[this.t] = this.am(0, n - 1, this, 0, 0, this.t);
+    ++this.t;
+    this.clamp();
+}
+
+// (protected) this += n << w words, this >= 0
+function bnpDAddOffset(n, w) {
+    if (n == 0) return;
+    while (this.t <= w) this[this.t++] = 0;
+    this[w] += n;
+    while (this[w] >= this.DV) {
+        this[w] -= this.DV;
+        if (++w >= this.t) this[this.t++] = 0;
+        ++this[w];
+    }
+}
+
+// A "null" reducer
+function NullExp() {}
+
+function nNop(x) {
+    return x;
+}
+
+function nMulTo(x, y, r) {
+    x.multiplyTo(y, r);
+}
+
+function nSqrTo(x, r) {
+    x.squareTo(r);
+}
+
+NullExp.prototype.convert = nNop;
+NullExp.prototype.revert = nNop;
+NullExp.prototype.mulTo = nMulTo;
+NullExp.prototype.sqrTo = nSqrTo;
+
+// (public) this^e
+function bnPow(e) {
+    return this.exp(e, new NullExp());
+}
+
+// (protected) r = lower n words of "this * a", a.t <= n
+// "this" should be the larger one if appropriate.
+function bnpMultiplyLowerTo(a, n, r) {
+    var i = Math.min(this.t + a.t, n);
+    r.s = 0; // assumes a,this >= 0
+    r.t = i;
+    while (i > 0) r[--i] = 0;
+    var j;
+    for (j = r.t - this.t; i < j; ++i) r[i + this.t] = this.am(0, a[i], r, i, 0, this.t);
+    for (j = Math.min(a.t, n); i < j; ++i) this.am(0, a[i], r, i, 0, n - i);
+    r.clamp();
+}
+
+// (protected) r = "this * a" without lower n words, n > 0
+// "this" should be the larger one if appropriate.
+function bnpMultiplyUpperTo(a, n, r) {
+    --n;
+    var i = r.t = this.t + a.t - n;
+    r.s = 0; // assumes a,this >= 0
+    while (--i >= 0) r[i] = 0;
+    for (i = Math.max(n - this.t, 0); i < a.t; ++i)
+        r[this.t + i - n] = this.am(n - i, a[i], r, 0, 0, this.t + i - n);
+    r.clamp();
+    r.drShiftTo(1, r);
+}
+
+// Barrett modular reduction
+function Barrett(m) {
+    // setup Barrett
+    this.r2 = nbi();
+    this.q3 = nbi();
+    BigInteger.ONE.dlShiftTo(2 * m.t, this.r2);
+    this.mu = this.r2.divide(m);
+    this.m = m;
+}
+
+function barrettConvert(x) {
+    if (x.s < 0 || x.t > 2 * this.m.t) return x.mod(this.m);
+    else if (x.compareTo(this.m) < 0) return x;
+    else {
+        var r = nbi();
+        x.copyTo(r);
+        this.reduce(r);
+        return r;
+    }
+}
+
+function barrettRevert(x) {
+    return x;
+}
+
+// x = x mod m (HAC 14.42)
+function barrettReduce(x) {
+    x.drShiftTo(this.m.t - 1, this.r2);
+    if (x.t > this.m.t + 1) {
+        x.t = this.m.t + 1;
+        x.clamp();
+    }
+    this.mu.multiplyUpperTo(this.r2, this.m.t + 1, this.q3);
+    this.m.multiplyLowerTo(this.q3, this.m.t + 1, this.r2);
+    while (x.compareTo(this.r2) < 0) x.dAddOffset(1, this.m.t + 1);
+    x.subTo(this.r2, x);
+    while (x.compareTo(this.m) >= 0) x.subTo(this.m, x);
+}
+
+// r = x^2 mod m; x != r
+function barrettSqrTo(x, r) {
+    x.squareTo(r);
+    this.reduce(r);
+}
+
+// r = x*y mod m; x,y != r
+function barrettMulTo(x, y, r) {
+    x.multiplyTo(y, r);
+    this.reduce(r);
+}
+
+Barrett.prototype.convert = barrettConvert;
+Barrett.prototype.revert = barrettRevert;
+Barrett.prototype.reduce = barrettReduce;
+Barrett.prototype.mulTo = barrettMulTo;
+Barrett.prototype.sqrTo = barrettSqrTo;
+
+// (public) this^e % m (HAC 14.85)
+function bnModPow(e, m) {
+    var i = e.bitLength(),
+        k, r = nbv(1),
+        z;
+    if (i <= 0) return r;
+    else if (i < 18) k = 1;
+    else if (i < 48) k = 3;
+    else if (i < 144) k = 4;
+    else if (i < 768) k = 5;
+    else k = 6;
+    if (i < 8)
+        z = new Classic(m);
+    else if (m.isEven())
+        z = new Barrett(m);
+    else
+        z = new Montgomery(m);
+
+    // precomputation
+    var g = [],
+        n = 3,
+        k1 = k - 1,
+        km = (1 << k) - 1;
+    g[1] = z.convert(this);
+    if (k > 1) {
+        var g2 = nbi();
+        z.sqrTo(g[1], g2);
+        while (n <= km) {
+            g[n] = nbi();
+            z.mulTo(g2, g[n - 2], g[n]);
+            n += 2;
+        }
+    }
+
+    var j = e.t - 1,
+        w, is1 = true,
+        r2 = nbi(),
+        t;
+    i = nbits(e[j]) - 1;
+    while (j >= 0) {
+        if (i >= k1) w = (e[j] >> (i - k1)) & km;
+        else {
+            w = (e[j] & ((1 << (i + 1)) - 1)) << (k1 - i);
+            if (j > 0) w |= e[j - 1] >> (this.DB + i - k1);
+        }
+
+        n = k;
+        while ((w & 1) == 0) {
+            w >>= 1;
+            --n;
+        }
+        if ((i -= n) < 0) {
+            i += this.DB;
+            --j;
+        }
+        if (is1) { // ret == 1, don't bother squaring or multiplying it
+            g[w].copyTo(r);
+            is1 = false;
+        } else {
+            while (n > 1) {
+                z.sqrTo(r, r2);
+                z.sqrTo(r2, r);
+                n -= 2;
+            }
+            if (n > 0) z.sqrTo(r, r2);
+            else {
+                t = r;
+                r = r2;
+                r2 = t;
+            }
+            z.mulTo(r2, g[w], r);
+        }
+
+        while (j >= 0 && (e[j] & (1 << i)) == 0) {
+            z.sqrTo(r, r2);
+            t = r;
+            r = r2;
+            r2 = t;
+            if (--i < 0) {
+                i = this.DB - 1;
+                --j;
+            }
+        }
+    }
+    return z.revert(r);
+}
+
+// (public) gcd(this,a) (HAC 14.54)
+function bnGCD(a) {
+    var x = (this.s < 0) ? this.negate() : this.clone();
+    var y = (a.s < 0) ? a.negate() : a.clone();
+    if (x.compareTo(y) < 0) {
+        var t = x;
+        x = y;
+        y = t;
+    }
+    var i = x.getLowestSetBit(),
+        g = y.getLowestSetBit();
+    if (g < 0) return x;
+    if (i < g) g = i;
+    if (g > 0) {
+        x.rShiftTo(g, x);
+        y.rShiftTo(g, y);
+    }
+    while (x.signum() > 0) {
+        if ((i = x.getLowestSetBit()) > 0) x.rShiftTo(i, x);
+        if ((i = y.getLowestSetBit()) > 0) y.rShiftTo(i, y);
+        if (x.compareTo(y) >= 0) {
+            x.subTo(y, x);
+            x.rShiftTo(1, x);
+        } else {
+            y.subTo(x, y);
+            y.rShiftTo(1, y);
+        }
+    }
+    if (g > 0) y.lShiftTo(g, y);
+    return y;
+}
+
+// (protected) this % n, n < 2^26
+function bnpModInt(n) {
+    if (n <= 0) return 0;
+    var d = this.DV % n,
+        r = (this.s < 0) ? n - 1 : 0;
+    if (this.t > 0)
+        if (d == 0) r = this[0] % n;
+        else
+            for (var i = this.t - 1; i >= 0; --i) r = (d * r + this[i]) % n;
+    return r;
+}
+
+// (public) 1/this % m (HAC 14.61)
+function bnModInverse(m) {
+    var ac = m.isEven();
+    if ((this.isEven() && ac) || m.signum() == 0) return BigInteger.ZERO;
+    var u = m.clone(),
+        v = this.clone();
+    var a = nbv(1),
+        b = nbv(0),
+        c = nbv(0),
+        d = nbv(1);
+    while (u.signum() != 0) {
+        while (u.isEven()) {
+            u.rShiftTo(1, u);
+            if (ac) {
+                if (!a.isEven() || !b.isEven()) {
+                    a.addTo(this, a);
+                    b.subTo(m, b);
+                }
+                a.rShiftTo(1, a);
+            } else if (!b.isEven()) b.subTo(m, b);
+            b.rShiftTo(1, b);
+        }
+        while (v.isEven()) {
+            v.rShiftTo(1, v);
+            if (ac) {
+                if (!c.isEven() || !d.isEven()) {
+                    c.addTo(this, c);
+                    d.subTo(m, d);
+                }
+                c.rShiftTo(1, c);
+            } else if (!d.isEven()) d.subTo(m, d);
+            d.rShiftTo(1, d);
+        }
+        if (u.compareTo(v) >= 0) {
+            u.subTo(v, u);
+            if (ac) a.subTo(c, a);
+            b.subTo(d, b);
+        } else {
+            v.subTo(u, v);
+            if (ac) c.subTo(a, c);
+            d.subTo(b, d);
+        }
+    }
+    if (v.compareTo(BigInteger.ONE) != 0) return BigInteger.ZERO;
+    if (d.compareTo(m) >= 0) return d.subtract(m);
+    if (d.signum() < 0) d.addTo(m, d);
+    else return d;
+    if (d.signum() < 0) return d.add(m);
+    else return d;
+}
+
+var lowprimes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509];
+var lplim = (1 << 26) / lowprimes[lowprimes.length - 1];
+
+// (public) test primality with certainty >= 1-.5^t
+function bnIsProbablePrime(t) {
+    var i, x = this.abs();
+    if (x.t == 1 && x[0] <= lowprimes[lowprimes.length - 1]) {
+        for (i = 0; i < lowprimes.length; ++i)
+            if (x[0] == lowprimes[i]) return true;
+        return false;
+    }
+    if (x.isEven()) return false;
+    i = 1;
+    while (i < lowprimes.length) {
+        var m = lowprimes[i],
+            j = i + 1;
+        while (j < lowprimes.length && m < lplim) m *= lowprimes[j++];
+        m = x.modInt(m);
+        while (i < j)
+            if (m % lowprimes[i++] == 0) return false;
+    }
+    return x.millerRabin(t);
+}
+
+// (protected) true if probably prime (HAC 4.24, Miller-Rabin)
+function bnpMillerRabin(t) {
+    var n1 = this.subtract(BigInteger.ONE);
+    var k = n1.getLowestSetBit();
+    if (k <= 0) return false;
+    var r = n1.shiftRight(k);
+    t = (t + 1) >> 1;
+    if (t > lowprimes.length) t = lowprimes.length;
+    var a = nbi();
+    for (var i = 0; i < t; ++i) {
+        a.fromInt(lowprimes[i]);
+        var y = a.modPow(r, this);
+        if (y.compareTo(BigInteger.ONE) != 0 && y.compareTo(n1) != 0) {
+            var j = 1;
+            while (j++ < k && y.compareTo(n1) != 0) {
+                y = y.modPowInt(2, this);
+                if (y.compareTo(BigInteger.ONE) == 0) return false;
+            }
+            if (y.compareTo(n1) != 0) return false;
+        }
+    }
+    return true;
+}
+
+
+
+// protected
+BigInteger.prototype.chunkSize = bnpChunkSize;
+BigInteger.prototype.toRadix = bnpToRadix;
+BigInteger.prototype.fromRadix = bnpFromRadix;
+BigInteger.prototype.fromNumber = bnpFromNumber;
+BigInteger.prototype.bitwiseTo = bnpBitwiseTo;
+BigInteger.prototype.changeBit = bnpChangeBit;
+BigInteger.prototype.addTo = bnpAddTo;
+BigInteger.prototype.dMultiply = bnpDMultiply;
+BigInteger.prototype.dAddOffset = bnpDAddOffset;
+BigInteger.prototype.multiplyLowerTo = bnpMultiplyLowerTo;
+BigInteger.prototype.multiplyUpperTo = bnpMultiplyUpperTo;
+BigInteger.prototype.modInt = bnpModInt;
+BigInteger.prototype.millerRabin = bnpMillerRabin;
+
+// public
+BigInteger.prototype.clone = bnClone;
+BigInteger.prototype.intValue = bnIntValue;
+BigInteger.prototype.byteValue = bnByteValue;
+BigInteger.prototype.shortValue = bnShortValue;
+BigInteger.prototype.signum = bnSigNum;
+BigInteger.prototype.toByteArray = bnToByteArray;
+BigInteger.prototype.equals = bnEquals;
+BigInteger.prototype.min = bnMin;
+BigInteger.prototype.max = bnMax;
+BigInteger.prototype.and = bnAnd;
+BigInteger.prototype.or = bnOr;
+BigInteger.prototype.xor = bnXor;
+BigInteger.prototype.andNot = bnAndNot;
+BigInteger.prototype.not = bnNot;
+BigInteger.prototype.shiftLeft = bnShiftLeft;
+BigInteger.prototype.shiftRight = bnShiftRight;
+BigInteger.prototype.getLowestSetBit = bnGetLowestSetBit;
+BigInteger.prototype.bitCount = bnBitCount;
+BigInteger.prototype.testBit = bnTestBit;
+BigInteger.prototype.setBit = bnSetBit;
+BigInteger.prototype.clearBit = bnClearBit;
+BigInteger.prototype.flipBit = bnFlipBit;
+BigInteger.prototype.add = bnAdd;
+BigInteger.prototype.subtract = bnSubtract;
+BigInteger.prototype.multiply = bnMultiply;
+BigInteger.prototype.divide = bnDivide;
+BigInteger.prototype.remainder = bnRemainder;
+BigInteger.prototype.divideAndRemainder = bnDivideAndRemainder;
+BigInteger.prototype.modPow = bnModPow;
+BigInteger.prototype.modInverse = bnModInverse;
+BigInteger.prototype.pow = bnPow;
+BigInteger.prototype.gcd = bnGCD;
+BigInteger.prototype.isProbablePrime = bnIsProbablePrime;
+
+// BigInteger interfaces not implemented in jsbn:
+
+// BigInteger(int signum, byte[] magnitude)
+// double doubleValue()
+// float floatValue()
+// int hashCode()
+// long longValue()
+// static BigInteger valueOf(long val)
+
+
+
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+// END OF copy-and-paste of jsbn.
+
+
+
+BigInteger.NEGATIVE_ONE = BigInteger.ONE.negate();
+
+
+// Other methods we need to add for compatibilty with js-numbers numeric tower.
+
+// add is implemented above.
+// subtract is implemented above.
+// multiply is implemented above.
+// equals is implemented above.
+// abs is implemented above.
+// negate is defined above.
+
+// makeBignum: string -> BigInteger
+var makeBignum = function(s) {
+    if (typeof(s) === 'number') {
+        s = s + '';
+    }
+    s = expandExponent(s);
+    return new BigInteger(s, 10);
+};
+
+var zerostring = function(n) {
+    var buf = [];
+    for (var i = 0; i < n; i++) {
+        buf.push('0');
+    }
+    return buf.join('');
+};
+
+
+BigInteger.prototype.level = 0;
+BigInteger.prototype.liftTo = function(target) {
+    if (target.level === 1) {
+        return new Rational(this, 1);
+    }
+    if (target.level === 2) {
+        var fixrep = this.toFixnum();
+        if (fixrep === Number.POSITIVE_INFINITY)
+            return TOO_POSITIVE_TO_REPRESENT;
+        if (fixrep === Number.NEGATIVE_INFINITY)
+            return TOO_NEGATIVE_TO_REPRESENT;
+        return new FloatPoint(fixrep);
+    }
+    if (target.level === 3) {
+        return new Complex(this, 0);
+    }
+    return throwRuntimeError("invalid level for BigInteger lift", this, target);
+};
+
+BigInteger.prototype.isFinite = function() {
+    return true;
+};
+
+BigInteger.prototype.isInteger = function() {
+    return true;
+};
+
+BigInteger.prototype.isRational = function() {
+    return true;
+};
+
+BigInteger.prototype.isReal = function() {
+    return true;
+};
+
+BigInteger.prototype.isExact = function() {
+    return true;
+};
+
+BigInteger.prototype.isInexact = function() {
+    return false;
+};
+
+BigInteger.prototype.toExact = function() {
+    return this;
+};
+
+BigInteger.prototype.toInexact = function() {
+    return FloatPoint.makeInstance(this.toFixnum());
+};
+
+BigInteger.prototype.toFixnum = function() {
+    var result = 0,
+        str = this.toString(),
+        i;
+    if (str[0] === '-') {
+        for (i = 1; i < str.length; i++) {
+            result = result * 10 + Number(str[i]);
+        }
+        return -result;
+    } else {
+        for (i = 0; i < str.length; i++) {
+            result = result * 10 + Number(str[i]);
+        }
+        return result;
+    }
+};
+
+
+BigInteger.prototype.greaterThan = function(other) {
+    return this.compareTo(other) > 0;
+};
+
+BigInteger.prototype.greaterThanOrEqual = function(other) {
+    return this.compareTo(other) >= 0;
+};
+
+BigInteger.prototype.lessThan = function(other) {
+    return this.compareTo(other) < 0;
+};
+
+BigInteger.prototype.lessThanOrEqual = function(other) {
+    return this.compareTo(other) <= 0;
+};
+
+// divide: scheme-number -> scheme-number
+// WARNING NOTE: we override the old version of divide.
+BigInteger.prototype.divide = function(other) {
+    var quotientAndRemainder = bnDivideAndRemainder.call(this, other);
+    if (quotientAndRemainder[1].compareTo(BigInteger.ZERO) === 0) {
+        return quotientAndRemainder[0];
+    } else {
+        var result = add(quotientAndRemainder[0],
+            Rational.makeInstance(quotientAndRemainder[1], other));
+        return result;
+    }
+};
+
+BigInteger.prototype.numerator = function() {
+    return this;
+};
+
+BigInteger.prototype.denominator = function() {
+    return 1;
+};
+
+
+(function() {
+    // Classic implementation of Newton-Ralphson square-root search,
+    // adapted for integer-sqrt.
+    // http://en.wikipedia.org/wiki/Newton's_method#Square_root_of_a_number
+    var searchIter = function(n, guess) {
+        while (!(lessThanOrEqual(sqr(guess), n) &&
+                lessThan(n, sqr(add(guess, 1))))) {
+            guess = floor(divide(add(guess,
+                    floor(divide(n, guess))),
+                2));
+        }
+        return guess;
+    };
+
+    // integerSqrt: -> scheme-number
+    BigInteger.prototype.integerSqrt = function() {
+        var n;
+        if (sign(this) >= 0) {
+            return searchIter(this, this);
+        } else {
+            n = this.negate();
+            return Complex.makeInstance(0, searchIter(n, n));
+        }
+    };
+})();
+
+
+(function() {
+    // Get an approximation using integerSqrt, and then start another
+    // Newton-Ralphson search if necessary.
+    BigInteger.prototype.sqrt = function() {
+        var approx = this.integerSqrt(),
+            fix;
+        if (eqv(sqr(approx), this)) {
+            return approx;
+        }
+        fix = toFixnum(this);
+        if (isFinite(fix)) {
+            if (fix >= 0) {
+                return FloatPoint.makeInstance(Math.sqrt(fix));
+            } else {
+                return Complex.makeInstance(
+                    0,
+                    FloatPoint.makeInstance(Math.sqrt(-fix)));
+            }
+        } else {
+            return approx;
+        }
+    };
+})();
+
+
+
+
+
+// sqrt: -> scheme-number
+// http://en.wikipedia.org/wiki/Newton's_method#Square_root_of_a_number
+// Produce the square root.
+
+// floor: -> scheme-number
+// Produce the floor.
+BigInteger.prototype.floor = function() {
+    return this;
+}
+
+// ceiling: -> scheme-number
+// Produce the ceiling.
+BigInteger.prototype.ceiling = function() {
+    return this;
+}
+
+// conjugate: -> scheme-number
+// Produce the conjugate.
+
+// magnitude: -> scheme-number
+// Produce the magnitude.
+
+// log: -> scheme-number
+// Produce the log.
+
+// angle: -> scheme-number
+// Produce the angle.
+
+// atan: -> scheme-number
+// Produce the arc tangent.
+
+// cos: -> scheme-number
+// Produce the cosine.
+
+// sin: -> scheme-number
+// Produce the sine.
+
+
+// expt: scheme-number -> scheme-number
+// Produce the power to the input.
+BigInteger.prototype.expt = function(n) {
+    return bnPow.call(this, n);
+};
+
+
+
+// exp: -> scheme-number
+// Produce e raised to the given power.
+
+// acos: -> scheme-number
+// Produce the arc cosine.
+
+// asin: -> scheme-number
+// Produce the arc sine.
+
+BigInteger.prototype.imaginaryPart = function() {
+    return 0;
+}
+BigInteger.prototype.realPart = function() {
+    return this;
+}
+
+// round: -> scheme-number
+// Round to the nearest integer.
+
+
+
+
+
+//////////////////////////////////////////////////////////////////////
+// toRepeatingDecimal: jsnum jsnum {limit: number}? -> [string, string, string]
+//
+// Given the numerator and denominator parts of a rational,
+// produces the repeating-decimal representation, where the first
+// part are the digits before the decimal, the second are the
+// non-repeating digits after the decimal, and the third are the
+// remaining repeating decimals.
+//
+// An optional limit on the decimal expansion can be provided, in which
+// case the search cuts off if we go past the limit.
+// If this happens, the third argument returned becomes '...' to indicate
+// that the search was prematurely cut off.
+var toRepeatingDecimal = (function() {
+    var getResidue = function(r, d, limit) {
+        var digits = [];
+        var seenRemainders = {};
+        seenRemainders[r] = true;
+        while (true) {
+            if (limit-- <= 0) {
+                return [digits.join(''), '...']
+            }
+
+            var nextDigit = quotient(
+                multiply(r, 10), d);
+            var nextRemainder = remainder(
+                multiply(r, 10),
+                d);
+            digits.push(nextDigit.toString());
+            if (seenRemainders[nextRemainder]) {
+                r = nextRemainder;
+                break;
+            } else {
+                seenRemainders[nextRemainder] = true;
+                r = nextRemainder;
+            }
+        }
+
+        var firstRepeatingRemainder = r;
+        var repeatingDigits = [];
+        while (true) {
+            var nextDigit = quotient(multiply(r, 10), d);
+            var nextRemainder = remainder(
+                multiply(r, 10),
+                d);
+            repeatingDigits.push(nextDigit.toString());
+            if (equals(nextRemainder, firstRepeatingRemainder)) {
+                break;
+            } else {
+                r = nextRemainder;
+            }
+        };
+
+        var digitString = digits.join('');
+        var repeatingDigitString = repeatingDigits.join('');
+
+        while (digitString.length >= repeatingDigitString.length &&
+            (digitString.substring(
+                    digitString.length - repeatingDigitString.length) ===
+                repeatingDigitString)) {
+            digitString = digitString.substring(
+                0, digitString.length - repeatingDigitString.length);
+        }
+
+        return [digitString, repeatingDigitString];
+
+    };
+
+    return function(n, d, options) {
+        // default limit on decimal expansion; can be overridden
+        var limit = 512;
+        if (options && typeof(options.limit) !== 'undefined') {
+            limit = options.limit;
+        }
+        if (!isInteger(n)) {
+            throwRuntimeError('toRepeatingDecimal: n ' + n.toString() +
+                " is not an integer.");
+        }
+        if (!isInteger(d)) {
+            throwRuntimeError('toRepeatingDecimal: d ' + d.toString() +
+                " is not an integer.");
+        }
+        if (equals(d, 0)) {
+            throwRuntimeError('toRepeatingDecimal: d equals 0');
+        }
+        if (lessThan(d, 0)) {
+            throwRuntimeError('toRepeatingDecimal: d < 0');
+        }
+        var sign = (lessThan(n, 0) ? "-" : "");
+        n = abs(n);
+        var beforeDecimalPoint = sign + quotient(n, d);
+        var afterDecimals = getResidue(remainder(n, d), d, limit);
+        return [beforeDecimalPoint].concat(afterDecimals);
+    };
+})();
+//////////////////////////////////////////////////////////////////////
+
+
+
+
+// External interface of js-numbers:
+
+const makeRational = Rational.makeInstance;
+const makeFloat = FloatPoint.makeInstance;
+const makeComplex = Complex.makeInstance;
+const pi = FloatPoint.pi;
+const e = FloatPoint.e;
+const nan = FloatPoint.nan;
+const negative_inf = FloatPoint.neginf;
+// const inf = FloatPoint.inf;
+const negative_one = -1;
+const one = 1;
+const zero = 0;
+
+export {
+    fromFixnum,
+    fromString,
+    makeBignum,
+    makeRational,
+    makeFloat,
+    makeComplex,
+    makeComplexPolar,
+    // pi,
+    e,
+    nan,
+    negative_inf,
+    inf,
+    negative_one, // Rational.NEGATIVE_ONE,
+    zero, // Rational.ZERO,
+    one, // Rational.ONE,
+    plusI as i,
+    minusI as negative_i,
+    NEGATIVE_ZERO as negative_zero,
+    onThrowRuntimeError,
+    isSchemeNumber,
+    isRational,
+    isReal,
+    isExact,
+    isInexact,
+    isInteger,
+    toFixnum,
+    toExact,
+    toInexact,
+    add,
+    subtract,
+    multiply,
+    divide,
+    equals,
+    eqv,
+    approxEquals,
+    greaterThanOrEqual,
+    lessThanOrEqual,
+    greaterThan,
+    lessThan,
+    expt,
+    exp,
+    modulo,
+    numerator,
+    denominator,
+    integerSqrt,
+    sqrt,
+    abs,
+    quotient,
+    remainder,
+    floor,
+    ceiling,
+    conjugate,
+    magnitude,
+    log,
+    angle,
+    tan,
+    atan,
+    atan2,
+    cos,
+    sin,
+    acos,
+    asin,
+    cosh,
+    sinh,
+    imaginaryPart,
+    realPart,
+    round,
+    sqr,
+    gcd,
+    lcm,
+    toRepeatingDecimal,
+    BigInteger,
+    Rational,
+    FloatPoint,
+    Complex,
+    MIN_FIXNUM,
+    MAX_FIXNUM,
+    bitwiseAnd,
+    bitwiseOr,
+    bitwiseXor,
+    bitwiseNot,
+    arithmeticShift
+};
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/primitive_symbol.js b/racketscript-compiler/racketscript/compiler/runtime/core/primitive_symbol.js
new file mode 100644
index 00000000..266e36ef
--- /dev/null
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/primitive_symbol.js
@@ -0,0 +1,81 @@
+import { PrintablePrimitive } from './printable_primitive.js';
+import { hashString } from './raw_hashing.js';
+
+let counter = 0;
+
+class PrimitiveSymbol extends PrintablePrimitive {
+    constructor(name) {
+        super();
+
+        if (name) {
+            // interned
+            this.name = name;
+            this.sym = Symbol.for(name);
+        } else {
+            // uninterned
+            this.sym = Symbol(`_${counter++}`);
+        }
+    }
+
+    get isInterned() {
+        return Boolean(this.name);
+    }
+
+    get value() {
+        return this.sym;
+    }
+
+    equals(s) {
+        if (s.sym) {
+            return s.value === this.value;
+        }
+        return s === this.value;
+    }
+
+    lt(s) {
+        if (s === this) {
+            return false;
+        }
+        return this.toString() < s.toString();
+    }
+
+    hashForEqual() {
+        return hashString(this.toString());
+    }
+
+    /* String printing */
+
+    [Symbol.toPrimitive](hint) {
+        if (hint === 'number') {
+            return 0;
+        }
+        return this.toString();
+    }
+
+    displayNativeString(out) {
+        if (this.isInterned) {
+            out.consume(Symbol.keyFor(this.sym));
+        } else {
+            out.consume(this.sym.toString());
+        }
+    }
+}
+
+export function make(v) {
+    return new PrimitiveSymbol(v ? v.toString() : '');
+}
+
+export function makeUninterned() {
+    return new PrimitiveSymbol();
+}
+
+export function check(v) {
+    return v instanceof PrimitiveSymbol;
+}
+
+export function isInterned(v) {
+    if (check(v)) {
+        return v.isInterned;
+    }
+    return false;
+}
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/raw_hashing.js b/racketscript-compiler/racketscript/compiler/runtime/core/raw_hashing.js
index 279a7b3c..eb5adb5f 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/raw_hashing.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/raw_hashing.js
@@ -14,14 +14,21 @@
  */
 export function hash(o) {
     if (o === null) return 0;
+    if (o && o.sym) return hashString(`sym_${o.toString()}`);
     switch (typeof o) {
-    case 'number': return hashNumber(o);
-    case 'string': return hashString(o);
-    case 'boolean': return o ? 1 : -1;
-    case 'undefined': return 0;
+    case 'number':
+        return hashNumber(o);
+    case 'string':
+        return hashString(o);
+    case 'boolean':
+        return o ? 1 : -1;
+    case 'undefined':
+        return 0;
     case 'object':
-    case 'function': return hashObjectIdentity(o);
-    default: return hashString(o.toString());
+    case 'function':
+        return hashObjectIdentity(o);
+    default:
+        return hashString(o.toString());
     }
 }
 
@@ -37,9 +44,9 @@ export function hashString(s) {
     let h = 0;
     const n = s.length;
     for (let i = 0; i < n; ++i) {
-        // Benchmarks of various ways to do this:
-        // https://run.perf.zone/view/String-Hashing-Performance-1504040177726
-        h = ~~(((h << 5) - h) + s.charCodeAt(i));
+    // Benchmarks of various ways to do this:
+    // https://run.perf.zone/view/String-Hashing-Performance-1504040177726
+        h = ~~((h << 5) - h + s.charCodeAt(i));
     }
     return h;
 }
@@ -66,8 +73,8 @@ export function hashNumber(n) {
     // This slightly increases the potential number of collisions
     // with large numbers and floats, but increases the performance by 20%.
     if (~~n === n) {
-        // If `n` is -0, the above check will pass.
-        // `~~` is here only to convert the potential -0 to 0.
+    // If `n` is -0, the above check will pass.
+    // `~~` is here only to convert the potential -0 to 0.
         return ~~n;
     }
     kBufAsF64[0] = n;
@@ -114,7 +121,7 @@ export function hashIntArray(a) {
     let h = 0;
     const n = a.length;
     for (let i = 0; i < n; ++i) {
-        h = ~~(((h << 5) - h) + a[i]);
+        h = ~~((h << 5) - h + a[i]);
     }
     return h;
 }
@@ -134,7 +141,7 @@ export function hashArray(a, valueToIntFn) {
     let h = 0;
     const n = a.length;
     for (let i = 0; i < n; ++i) {
-        h = ~~(((h << 5) - h) + valueToIntFn(a[i]));
+        h = ~~((h << 5) - h + valueToIntFn(a[i]));
     }
     return h;
 }
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/regexp.js b/racketscript-compiler/racketscript/compiler/runtime/core/regexp.js
index cebcadc0..d1f04e96 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/regexp.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/regexp.js
@@ -23,9 +23,11 @@ export function fromString(str) {
 /**
  * @param {!(RegExp|Uint8Array|UString.UString)} pattern
  * @param {!(Uint8Array|UString.UString)} input
+ * @param {!Int} start-pos
+ * @param {!Int|#f} end-pos
  * @return {!Pair.Pair|false} A list of bytes or strings, depending on the input.
  */
-export function match(pattern, input) {
+export function match(pattern, input, start, _end) {
     // TODO: Contract-checking should happen in kernel.rkt.
     const isRegexpPattern = check(pattern);
     const isBytesPattern = !isRegexpPattern && Bytes.check(pattern);
@@ -49,7 +51,9 @@ export function match(pattern, input) {
         ? UString.fromBytesUtf8(/** @type {!Uint8Array} */(pattern))
         : pattern;
 
-    const result = stringInput.toString().match(stringOrRegExpPattern);
+    const end = ((typeof _end) === 'number') ? _end : stringInput.length;
+
+    const result = stringInput.toString().slice(start, end).match(stringOrRegExpPattern);
 
     if (result === null) {
         return false;
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/struct.js b/racketscript-compiler/racketscript/compiler/runtime/core/struct.js
index 1a435e41..c7b50011 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/struct.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/struct.js
@@ -232,6 +232,11 @@ class StructTypeDescriptor extends PrintablePrimitive {
         // those of super types
         this._totalInitFields = options.initFieldCount;
         if (options.superType) {
+            C.falsy(
+                options.superType._isSealed(),
+                racketCoreError,
+                'make-struct-type: cannot make a subtype of a sealed type'
+            );
             this._totalInitFields += options.superType._totalInitFields;
         }
 
@@ -401,6 +406,18 @@ class StructTypeDescriptor extends PrintablePrimitive {
     isFieldImmutable(n) {
         return this._options.immutables.has(n);
     }
+
+    _isSealed() {
+        for (let desc = this; desc; desc = desc.getSuperType()) {
+            for (const [prop, val] of desc._options.props) {
+                if (prop._isSealedProperty()) {
+                    return val;
+                }
+            }
+        }
+
+        return false; // should be undefined, testing for now
+    }
 }
 
 /** ************************************************************************** */
@@ -484,6 +501,10 @@ class StructTypeProperty extends PrintablePrimitive {
             prop.attachToStructTypeDescriptor(desc, proc(newV));
         });
     }
+
+    _isSealedProperty() {
+        return this._name === 'prop:sealed';
+    }
 }
 
 /** ************************************************************************** */
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/symbol.js b/racketscript-compiler/racketscript/compiler/runtime/core/symbol.js
deleted file mode 100644
index d13c5cd6..00000000
--- a/racketscript-compiler/racketscript/compiler/runtime/core/symbol.js
+++ /dev/null
@@ -1,53 +0,0 @@
-import { PrintablePrimitive } from './printable_primitive.js';
-import { internedMake } from './lib.js';
-
-class Symbol extends PrintablePrimitive {
-    constructor(v) {
-        super();
-        this.v = v;
-        this._cachedHashCode = null;
-    }
-
-    /**
-     * @param {!Ports.NativeStringOutputPort} out
-     */
-    displayNativeString(out) {
-        out.consume(this.v);
-    }
-
-    equals(v) {
-        // Symbols are interned by default, and two symbols
-        // with same name can't be unequal.
-        // Eg. (define x (gensym)) ;;=> 'g60
-        //     (equal? x 'g60)     ;;=> #f
-        // TODO: does this handle uninterned symbols?
-        return v === this;
-    }
-
-    lt(v) {
-        if (v === this) {
-            return false;
-        }
-        return this.v < v.v;
-    }
-
-    /**
-     * @return {!number}
-     */
-    hashForEqual() {
-        if (this._cachedHashCode === null) {
-            this._cachedHashCode = super.hashForEqual();
-        }
-        return this._cachedHashCode;
-    }
-}
-
-
-export const make = internedMake(v => new Symbol(v.toString()));
-
-// TODO: is it correct to convert toString()?
-export const makeUninterned = v => new Symbol(v.toString());
-
-export function check(v) {
-    return (v instanceof Symbol);
-}
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/unicode_string.js b/racketscript-compiler/racketscript/compiler/runtime/core/unicode_string.js
index d454f9e0..b49cc9b0 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/unicode_string.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/unicode_string.js
@@ -480,6 +480,14 @@ export function toBytesUtf8(str) {
     return utf8Encoder.encode(str.toString());
 }
 
+/**
+ * @param {!(UString|String)} str
+ * @return {!Char.Char[]} chars
+ */
+export function toArray(str) {
+    return str.chars;
+}
+
 /**
  * @param {!Uint8Array} bytes
  * @return {!MutableUString}
@@ -488,6 +496,14 @@ export function fromBytesUtf8(bytes) {
     return makeMutable(Bytes.toString(bytes));
 }
 
+/**
+ * @param {!Uint8Array} bytes
+ * @return {!MutableUString}
+ */
+export function fromBytesLatin1(bytes) {
+    return makeMutable(Bytes.toString(bytes));
+}
+
 /**
  * @param {!UString[]} strs
  * @return {!MutableUString}
diff --git a/racketscript-compiler/racketscript/compiler/runtime/core/vector.js b/racketscript-compiler/racketscript/compiler/runtime/core/vector.js
index edf71532..2834539d 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/core/vector.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/core/vector.js
@@ -61,6 +61,14 @@ class Vector extends PrintablePrimitive {
         this.items[n] = v;
     }
 
+    copy(destStart, src, srcStart, srcEnd) {
+        for (let i = srcStart, j = destStart;
+            i < srcEnd && i < src.items.length && j < this.items.length;
+            i++, j++) {
+            this.items[j] = src.items[i];
+        }
+    }
+
     length() {
         return this.items.length;
     }
@@ -106,7 +114,6 @@ export function copy(vec, mutable) {
     return new Vector(vec.items, mutable);
 }
 
-
 export function makeInit(size, init) {
     const r = new Array(size);
     r.fill(init);
diff --git a/racketscript-compiler/racketscript/compiler/runtime/flfxnum.rkt b/racketscript-compiler/racketscript/compiler/runtime/flfxnum.rkt
index 2ce41ff7..88e193fa 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/flfxnum.rkt
+++ b/racketscript-compiler/racketscript/compiler/runtime/flfxnum.rkt
@@ -1,35 +1,65 @@
 #lang racketscript/boot
 
-(require racketscript/interop "lib.rkt" (for-syntax syntax/parse))
+(require racketscript/interop
+         racketscript/compiler/directive
+         "kernel.rkt"
+         "lib.rkt"
+         (for-syntax syntax/parse))
 
-(define+provide fl*  (#js.Core.attachProcedureArity #js.Core.Number.mul 0))
-(define+provide fl/  (#js.Core.attachProcedureArity #js.Core.Number.div 1))
-(define+provide fl+  (#js.Core.attachProcedureArity #js.Core.Number.add 0))
-(define+provide fl-  (#js.Core.attachProcedureArity #js.Core.Number.sub 1))
-(define+provide fl<  (#js.Core.attachProcedureArity #js.Core.Number.lt 1))
-(define+provide fl>  (#js.Core.attachProcedureArity #js.Core.Number.gt 1))
-(define+provide fl<= (#js.Core.attachProcedureArity #js.Core.Number.lte 1))
-(define+provide fl>= (#js.Core.attachProcedureArity #js.Core.Number.gte 1))
-(define+provide fl=  (#js.Core.attachProcedureArity #js.Core.Number.equals 1))
+(define+provide fl*  (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.multiply
+                                                                       #js.Core.Number.JS.mul ) 0))
+(define+provide fl/  (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.divide
+                                                                       #js.Core.Number.JS.div ) 1))
+(define+provide fl+  (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.add
+                                                                       #js.Core.Number.JS.add ) 0))
+(define+provide fl-  (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.subtract
+                                                                       #js.Core.Number.JS.sub ) 1))
+(define+provide fl<  (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.lessThan
+                                                                       #js.Core.Number.JS.lt ) 1))
+(define+provide fl>  (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.greaterThan
+                                                                       #js.Core.Number.JS.gt ) 1))
+(define+provide fl<= (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.lessThanOrEqual
+                                                                       #js.Core.Number.JS.lte ) 1))
+(define+provide fl>= (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.greaterThanOrEqual
+                                                                       #js.Core.Number.JS.gte ) 1))
+(define+provide fl=  (#js.Core.attachProcedureArity (if-scheme-numbers #js.Core.Number.Scheme.approxEquals
+                                                                       #js.Core.Number.JS.equals ) 1))
 
-(define+provide flabs #js.Math.abs)
-(define+provide flmin #js.Math.min)
-(define+provide flmax #js.Math.max)
-(define+provide flround #js.Math.round)
-(define+provide flfloor #js.Math.floor)
-(define+provide flceiling #js.Math.ceil)
-(define+provide fltruncate #js.Math.trunc)
+(define+provide flabs (if-scheme-numbers #js.Core.Number.Scheme.abs
+                                         #js.Math.abs))
+(define+provide flmin (if-scheme-numbers min
+                                         #js.Math.min))
+(define+provide flmax (if-scheme-numbers max
+                                         #js.Math.max))
+(define+provide flround (if-scheme-numbers round
+                                           #js.Math.round))
+(define+provide flfloor (if-scheme-numbers floor
+                                           #js.Math.floor))
+(define+provide flceiling (if-scheme-numbers ceiling
+                                             #js.Math.ceil))
+(define+provide fltruncate (if-scheme-numbers truncate
+                                              #js.Math.trunc))
 
-(define+provide flsin #js.Math.sin)
-(define+provide flcos #js.Math.cos)
-(define+provide fltan #js.Math.tan)
-(define+provide flasin #js.Math.asin)
-(define+provide flacos #js.Math.acos)
-(define+provide flatan #js.Math.atan)
-(define+provide fllog #js.Math.log)
-(define+provide flexp #js.Math.exp)
-(define+provide flsqrt #js.Math.sqrt)
-(define+provide flexpt #js.Math.pow)
+(define+provide flsin (if-scheme-numbers sin
+                                         #js.Math.sin))
+(define+provide flcos (if-scheme-numbers cos
+                                         #js.Math.cos))
+(define+provide fltan (if-scheme-numbers tan
+                                         #js.Math.tan))
+(define+provide flasin (if-scheme-numbers asin
+                                          #js.Math.asin))
+(define+provide flacos (if-scheme-numbers acos
+                                          #js.Math.acos))
+(define+provide flatan (if-scheme-numbers atan
+                                          #js.Math.atan))
+(define+provide fllog (if-scheme-numbers log
+                                         #js.Math.log))
+(define+provide flexp (if-scheme-numbers exp
+                                         #js.Math.exp))
+(define+provide flsqrt (if-scheme-numbers sqrt
+                                          #js.Math.sqrt))
+(define+provide flexpt (if-scheme-numbers expt
+                                          #js.Math.pow))
   
 (define-binop bitwise-or \|)
 
@@ -77,5 +107,9 @@
 (define-fx-binop+provide fxand     &&)
 (define-fx-binop+provide fxior     \|\|)
 (define-fx-binop+provide fxxor     ^)
-(define+provide fxnot                     #js.Core.bitwiseNot)
+(define+provide fxnot #js.Core.bitwiseNot)
 
+(define+provide flvector #js.Array.from) ; just create regular array
+(define+provide flvector? #js.Array.isArray)
+(define+provide fxvector #js.Array.from) ; just create regular array
+(define+provide fxvector? #js.Array.isArray)
diff --git a/racketscript-compiler/racketscript/compiler/runtime/kernel.js b/racketscript-compiler/racketscript/compiler/runtime/kernel.js
index 71448b1b..f1f029d6 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/kernel.js
+++ b/racketscript-compiler/racketscript/compiler/runtime/kernel.js
@@ -7,10 +7,11 @@ import * as Paramz from './paramz.js';
 export function isImmutable(v) {
     if (Core.Primitive.check(v)) {
         return v.isImmutable();
-    } else if (Core.Bytes.check(v) || typeof v === 'string') {
+    }
+    if (Core.Bytes.check(v) || typeof v === 'string') {
         return true;
-    } else if (typeof v === 'number' || typeof v === 'boolean' ||
-        typeof v === 'undefined' || v === null) {
+    }
+    if (typeof v === 'number' || typeof v === 'boolean' || typeof v === 'undefined' || v === null) {
         return false;
     }
     throw Core.racketCoreError('isImmutable not implemented for', v);
@@ -33,20 +34,32 @@ export function fprintf(isPrintAsExpression, out, form, ...args) {
     let lastMatch = '';
 
     const matches = formStr.match(regex);
-    const numExpected = matches ?
-        matches.filter(m => !NO_ARG_FORM_RE.test(m)).length : 0;
+    const numExpected = matches
+        ? matches.filter(m => !NO_ARG_FORM_RE.test(m)).length
+        : 0;
     if (numExpected !== args.length) {
-        throw Core.racketContractError(`fprintf: format string requires ${numExpected} arguments, ` +
-            `given ${args.length}; arguments were:`, out, form, ...args);
+        throw Core.racketContractError(
+            `fprintf: format string requires ${numExpected} arguments, `
+            + `given ${args.length}; arguments were:`,
+            out,
+            form,
+            ...args
+        );
     }
 
     // eslint-disable-next-line no-cond-assign
     while ((reExecResult = regex.exec(formStr)) !== null) {
-        Core.display(out, formStr.slice(prevIndex + lastMatch.length, reExecResult.index));
+        Core.display(
+            out,
+            formStr.slice(prevIndex + lastMatch.length, reExecResult.index)
+        );
         prevIndex = reExecResult.index;
         lastMatch = reExecResult[0]; // eslint-disable-line prefer-destructuring
         if (/^~\s/.test(lastMatch)) continue; // eslint-disable-line no-continue
-        switch (lastMatch.charAt(1)) { // eslint-disable-line default-case
+        // eslint-disable-next-line default-case
+        switch (
+            lastMatch.charAt(1)
+        ) {
         case '~':
             Core.display(out, '~');
             continue; // eslint-disable-line no-continue
@@ -76,17 +89,17 @@ export function fprintf(isPrintAsExpression, out, form, ...args) {
             break;
         case 'b':
         case 'B':
-            // TODO: raise exn:fail:contract if the number is not exact.
+        // TODO: raise exn:fail:contract if the number is not exact.
             Core.display(out, v.toString(2));
             break;
         case 'o':
         case 'O':
-            // TODO: raise exn:fail:contract if the number is not exact.
+        // TODO: raise exn:fail:contract if the number is not exact.
             Core.display(out, v.toString(8));
             break;
         case 'x':
         case 'X':
-            // TODO: raise exn:fail:contract if the number is not exact.
+        // TODO: raise exn:fail:contract if the number is not exact.
             Core.display(out, v.toString(16));
             break;
         default:
@@ -119,11 +132,11 @@ export function listToString(charsList) {
 // Errors
 
 /**
- * @param {Core.Symbol|Core.UString|String} firstArg
+ * @param {Core.PrimitiveSymbol|Core.UString|String} firstArg
  * @param {*[]} rest
  */
 export function error(firstArg, ...rest) {
-    if (Core.Symbol.check(firstArg)) {
+    if (Core.PrimitiveSymbol.check(firstArg)) {
         if (rest.length === 0) {
             throw Core.racketCoreError(firstArg.toString());
         } else {
@@ -153,7 +166,7 @@ export function doraise(e) {
 }
 
 /**
- * @param {Core.Symbol} name
+ * @param {Core.PrimitiveSymbol} name
  * @param {Core.UString|String} expected
  * @param {*[]} rest
  */
@@ -163,9 +176,11 @@ export function doraise(e) {
 //  (raise-argument-error name expected bad-pos arg ...)
 export function argerror(name, expected, ...rest) {
     let theerr;
-    if (Core.Symbol.check(name)
+    if (
+        Core.PrimitiveSymbol.check(name)
         && (Core.UString.check(expected) || typeof expected === 'string')
-        && rest.length >= 1) {
+        && rest.length >= 1
+    ) {
         theerr = Core.makeArgumentError(name, expected, ...rest);
     } else {
         theerr = Core.racketContractError('raise-argument-error: invalid arguments');
@@ -175,7 +190,7 @@ export function argerror(name, expected, ...rest) {
 }
 
 /**
- * @param {Core.Symbol} name
+ * @param {Core.PrimitiveSymbol} name
  * @param {Core.UString|String} expected
  * @param {*[]} rest
  */
@@ -185,9 +200,11 @@ export function argerror(name, expected, ...rest) {
 //  (raise-result-error name expected bad-pos arg ...)
 export function resulterror(name, expected, ...rest) {
     let theerr;
-    if (Core.Symbol.check(name)
+    if (
+        Core.PrimitiveSymbol.check(name)
         && (Core.UString.check(expected) || typeof expected === 'string')
-        && rest.length >= 1) {
+        && rest.length >= 1
+    ) {
         theerr = Core.makeResultError(name, expected, ...rest);
     } else {
         theerr = Core.racketContractError('raise-result-error: invalid result');
@@ -197,7 +214,7 @@ export function resulterror(name, expected, ...rest) {
 }
 
 /**
- * @param {Core.Symbol} name
+ * @param {Core.PrimitiveSymbol} name
  * @param {Core.UString|String} msg
  * @param {Core.UString|String} field
  * @param {*[]} rest
@@ -206,10 +223,12 @@ export function resulterror(name, expected, ...rest) {
 // so rest must be at least 1 and must be odd bc each field must have matching v
 export function argserror(name, msg, field, ...rest) {
     let theerr;
-    if (Core.Symbol.check(name)
+    if (
+        Core.PrimitiveSymbol.check(name)
         && (Core.UString.check(msg) || typeof msg === 'string')
         && (Core.UString.check(field) || typeof field === 'string')
-        && rest.length >= 1 && rest.length % 2 === 1) {
+        && rest.length >= 1 && rest.length % 2 === 1
+    ) {
         theerr = Core.makeArgumentsError(name, msg, field, ...rest);
     } else {
         theerr = Core.racketContractError('raise-arguments-error: invalid arguments');
@@ -219,7 +238,7 @@ export function argserror(name, msg, field, ...rest) {
 }
 
 /**
- * @param {Core.Symbol} name
+ * @param {Core.PrimitiveSymbol} name
  * @param {Core.UString|String} msg
  * @param {*[]} rest
  */
@@ -228,8 +247,10 @@ export function argserror(name, msg, field, ...rest) {
 // so ...rst might have additional msg, v ...
 export function mismatcherror(name, msg, ...rest) {
     let theerr;
-    if (Core.Symbol.check(name)
-        && (Core.UString.check(msg) || typeof msg === 'string')) {
+    if (
+        Core.PrimitiveSymbol.check(name)
+        && (Core.UString.check(msg) || typeof msg === 'string')
+    ) {
         theerr = Core.makeMismatchError(name, msg, ...rest);
     } else {
         theerr = Core.racketContractError('error: invalid arguments');
@@ -249,8 +270,12 @@ export function mismatcherror(name, msg, ...rest) {
 // usage: raise-range-error name, type, v len, i
 export function outofrangeerror(name, type, v, len, i) {
     let theerr;
-    if (typeof name === 'string' && typeof type === 'string' &&
-        typeof len === 'number' && typeof i === 'number') {
+    if (
+        typeof name === 'string'
+        && typeof type === 'string'
+        && typeof len === 'number'
+        && typeof i === 'number'
+    ) {
         theerr = Core.makeOutOfRangeError(name, type, v, len, i);
     } else {
         theerr = Core.racketContractError('error: invalid arguments');
@@ -264,7 +289,8 @@ export function outofrangeerror(name, type, v, len, i) {
 
 export function random(...args) {
     switch (args.length) {
-    case 0: return Math.random();
+    case 0:
+        return Math.random();
     case 1:
         if (args[0] > 0) {
             return Math.floor(Math.random() * args[0]);
diff --git a/racketscript-compiler/racketscript/compiler/runtime/kernel.rkt b/racketscript-compiler/racketscript/compiler/runtime/kernel.rkt
index 87478b32..daa66c5f 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/kernel.rkt
+++ b/racketscript-compiler/racketscript/compiler/runtime/kernel.rkt
@@ -2,6 +2,7 @@
 
 (require (for-syntax syntax/parse)
          racketscript/interop
+         racketscript/compiler/directive
          "lib.rkt")
 
 ;; ----------------------------------------------------------------------------
@@ -50,129 +51,330 @@
 ;; ----------------------------------------------------------------------------
 ;; Numbers
 
-(define+provide number?   #js.Core.Number.check)
-(define+provide real?     #js.Core.Number.check)
-(define+provide integer?  #js.Number.isInteger)
+(define+provide number?   (if-scheme-numbers #js.Core.Number.Scheme.isSchemeNumber
+                                             #js.Core.Number.JS.check))
+(define+provide real?     (if-scheme-numbers #js.Core.Number.Scheme.isReal
+                                             #js.Core.Number.JS.check))
+(define+provide integer?  (if-scheme-numbers #js.Core.Number.Scheme.isInteger
+                                             #js.Number.isInteger))
+
+(define-syntax (define+provide/scheme-numbers stx)
+  (syntax-parse stx
+    [(_ identifier:id binding:expr)
+     #`(define+provide identifier
+         (if-scheme-numbers binding
+                            (lambda _
+                              (#js.Core.racketCoreError "Not supported with JS number semantics"))))]
+    [(_ (identifier:id args:expr ...) body:expr ...)
+     #'(define+provide/scheme-numbers identifier
+         (λ (args ...) body ...))]))
+
+(define-syntax (define-checked+provide/scheme-numbers stx)
+  (syntax-parse stx
+    [(_ (identifier:id [arg:expr pred:expr] ...) body:expr)
+     #`(define-checked+provide (identifier [arg pred] ...)
+         (if-scheme-numbers body
+                            (lambda _
+                              (#js.Core.racketCoreError "Not supported with JS number semantics"))))]))
+
+(define+provide/scheme-numbers complex? number?)
 
 (define-checked+provide (zero? [v number?])
-  (binop === v 0))
+  (if-scheme-numbers (#js.Core.Number.Scheme.equals #js.Core.Number.Scheme.zero v)
+                     (binop === v 0)))
 
 (define-checked+provide (positive? [v real?])
-  (binop > v 0))
+  (if-scheme-numbers (#js.Core.Number.Scheme.greaterThan v #js.Core.Number.Scheme.zero)
+                     (binop > v 0)))
 
 (define-checked+provide (negative? [v real?])
-  (binop < v 0))
+  (if-scheme-numbers (#js.Core.Number.Scheme.lessThan v #js.Core.Number.Scheme.zero)
+                     (binop < v 0)))
 
 (define-checked+provide (add1 [v number?])
-  (binop + v 1))
+  (if-scheme-numbers (#js.Core.Number.Scheme.add v #js.Core.Number.Scheme.one)
+                     (binop + v 1)))
 
 (define-checked+provide (sub1 [v number?])
-  (binop - v 1))
+  (if-scheme-numbers (#js.Core.Number.Scheme.subtract v #js.Core.Number.Scheme.one)
+                     (binop - v 1)))
 
 (define-checked+provide (quotient [dividend integer?] [divisor integer?])
-  (binop \| (binop / dividend divisor) 0))
+  (if-scheme-numbers (#js.Core.Number.Scheme.quotient dividend divisor)
+                     (binop \| (binop / dividend divisor) 0)))
 
 (define-checked+provide (even? [v integer?])
-  (binop === (binop % v 2) 0))
+  (if-scheme-numbers (#js.Core.Number.Scheme.equals (#js.Core.Number.Scheme.modulo v 2) 0)
+                     (binop === (binop % v 2) 0)))
 
 (define-checked+provide (odd? [v integer?])
-  (not (binop === (binop % v 2) 0)))
+  (not (even? v)))
 
 (define+provide (exact-nonnegative-integer? v)
-  (and (#js.Number.isInteger v) (binop >= v 0)))
+  (if-scheme-numbers (and (integer? v)
+                          (#js.Core.Number.Scheme.greaterThanOrEqual v 0)
+                          (exact? v))
+                     (and (#js.Number.isInteger v) (binop >= v 0))))
 
 (define+provide (exact-integer? v)
-  (#js.Number.isInteger v))
+  (if-scheme-numbers (and (integer? v)
+                          (exact? v))
+                     (#js.Number.isInteger v)))
 
 (define+provide (exact? v)
-  (#js.Number.isInteger v))
+  (if-scheme-numbers (#js.Core.Number.Scheme.isExact v)
+                     (#js.Number.isInteger v)))
+
+(define+provide (inexact? v) (not (exact? v)))
 
 ;; single-flonum not implemented
-(define+provide (single-flonum-available?) #f)
-(define+provide (single-flonum?) #f)
-(define+provide (real->single-flonum v) v)
-
-(define+provide *  (#js.Core.attachProcedureArity #js.Core.Number.mul 0))
-(define+provide /  (#js.Core.attachProcedureArity #js.Core.Number.div 1))
-(define+provide +  (#js.Core.attachProcedureArity #js.Core.Number.add 0))
-(define+provide -  (#js.Core.attachProcedureArity #js.Core.Number.sub 1))
-(define+provide <  (#js.Core.attachProcedureArity #js.Core.Number.lt 1))
-(define+provide >  (#js.Core.attachProcedureArity #js.Core.Number.gt 1))
-(define+provide <= (#js.Core.attachProcedureArity #js.Core.Number.lte 1))
-(define+provide >= (#js.Core.attachProcedureArity #js.Core.Number.gte 1))
-(define+provide =  (#js.Core.attachProcedureArity #js.Core.Number.equals 1))
+(define+provide (single-flonum-available?) (if-scheme-numbers #f
+                                                              #f))
+(define+provide (single-flonum?) (if-scheme-numbers #f
+                                                    #f))
+(define+provide (real->single-flonum v) (if-scheme-numbers v
+                                                           v))
+
+(define+provide *
+  (if-scheme-numbers (#js.Core.attachProcedureArity (λ nums
+                                                      (cond
+                                                        [(null? nums)
+                                                         1]
+                                                        [(null? (cdr nums))
+                                                         (car nums)]
+                                                        [else
+                                                         (#js.Core.Number.Scheme.multiply (car nums) (apply * (cdr nums)))]))
+                      0)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.mul 0)))
+(define+provide /
+  (if-scheme-numbers (#js.Core.attachProcedureArity (λ nums
+                                                      (cond
+                                                        [(null? (cdr nums))
+                                                         (#js.Core.Number.Scheme.divide 1 (car nums))]
+                                                        [else
+                                                         (foldl (λ (x y)
+                                                                  (#js.Core.Number.Scheme.divide y x))
+                                                                (car nums)
+                                                                (cdr nums))]))
+                      1)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.div 1)))
+(define+provide +
+  (if-scheme-numbers (#js.Core.attachProcedureArity (λ nums
+                                                      (cond
+                                                        [(null? nums)
+                                                         0]
+                                                        [(null? (cdr nums))
+                                                         (car nums)]
+                                                        [else
+                                                         (#js.Core.Number.Scheme.add (car nums) (apply + (cdr nums)))]))
+                      0)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.add 0)))
+(define+provide -
+  (if-scheme-numbers (#js.Core.attachProcedureArity (λ nums
+                                                      (cond
+                                                        [(null? (cdr nums))
+                                                         (#js.Core.Number.Scheme.subtract 0 (car nums))]
+                                                        [else
+                                                         (foldl (λ (n acc)
+                                                                  (#js.Core.Number.Scheme.subtract acc n))
+                                                                (car nums)
+                                                                (cdr nums))]))
+                      1)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.sub 1)))
+
+(define-syntax-rule (make-js-comparison op jsop)
+  (λ nums
+    (cond
+      [(null? nums)
+       #t]
+      [(null? (cdr nums))
+       #t]
+      [else
+       (and (jsop (car nums) (car (cdr nums)))
+            (apply op (cdr nums)))])))
+
+(define+provide <
+  (if-scheme-numbers (#js.Core.attachProcedureArity (make-js-comparison < #js.Core.Number.Scheme.lessThan) 1)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.lt 1)))
+(define+provide >
+  (if-scheme-numbers (#js.Core.attachProcedureArity (make-js-comparison > #js.Core.Number.Scheme.greaterThan) 1)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.gt 1)))
+(define+provide <=
+  (if-scheme-numbers (#js.Core.attachProcedureArity (make-js-comparison <= #js.Core.Number.Scheme.lessThanOrEqual) 1)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.lte 1)))
+(define+provide >=
+  (if-scheme-numbers (#js.Core.attachProcedureArity (make-js-comparison >= #js.Core.Number.Scheme.greaterThanOrEqual) 1)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.gte 1)))
+(define+provide =
+  (if-scheme-numbers (#js.Core.attachProcedureArity (make-js-comparison = #js.Core.Number.Scheme.equals) 1)
+                     (#js.Core.attachProcedureArity #js.Core.Number.JS.equals 1)))
 
 (define-checked+provide (floor [v real?])
-  (#js.Math.floor v))
+  (if-scheme-numbers (#js.Core.Number.Scheme.floor v)
+                     (#js.Math.floor v)))
 (define-checked+provide (abs [v real?])
-  (#js.Math.abs v))
-(define-checked+provide (sin [v real?])
-  (#js.Math.sin v))
-(define-checked+provide (cos [v real?])
-  (#js.Math.cos v))
-(define-checked+provide (tan [v real?])
-  (#js.Math.tan v))
-(define-checked+provide (atan [v real?])
-  (#js.Math.atan v))
+  (if-scheme-numbers (#js.Core.Number.Scheme.abs v)
+                     (#js.Math.abs v)))
+(define-checked+provide (sin [v number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.sin v)
+                     (#js.Math.sin v)))
+(define-checked+provide (cos [v number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.cos v)
+                     (#js.Math.cos v)))
+(define-checked+provide (tan [v number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.tan v)
+                     (#js.Math.tan v)))
+(define-checked+provide (asin [v number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.asin v)
+                     (#js.Math.asin v)))
+(define-checked+provide (acos [v number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.acos v)
+                     (#js.Math.acos v)))
+(define+provide atan
+  (if-scheme-numbers (case-lambda
+                       [(x) (#js.Core.Number.Scheme.atan x)]
+                       [(x y) (#js.Core.Number.Scheme.atan2 x y)])
+                     (case-lambda
+                       [(v) (#js.Math.atan v)]
+                       [(x y) (#js.Math.atan2 x y)])))
 
 (define-checked+provide (ceiling [v real?])
-  (#js.Math.ceil v))
+  (if-scheme-numbers (#js.Core.Number.Scheme.ceiling v)
+                     (#js.Math.ceil v)))
 (define-checked+provide (round [v real?])
-  (#js.Math.round v))
+  (if-scheme-numbers (#js.Core.Number.Scheme.round v)
+                     (#js.Math.round v)))
 
 (define-checked+provide (min [a real?] [b real?])
-  (#js.Math.min a b))
+  (if-scheme-numbers (cond
+                       [(not (and (number? a)
+                                  (number? b)))
+                        #js.Core.Number.Scheme.nan]
+                       [(#js.Core.Number.Scheme.lessThan a b) a]
+                       [else b])
+                     (#js.Math.min a b)))
 (define-checked+provide (max [a real?] [b real?])
-  (#js.Math.max a b))
-
-(define-checked+provide (log [v real?])
-  (#js.Math.log v))
+  (if-scheme-numbers (cond
+                       [(not (and (number? a)
+                                  (number? b)))
+                        #js.Core.Number.Scheme.nan]
+                       [(#js.Core.Number.Scheme.greaterThan a b) a]
+                       [else b])
+                     (#js.Math.max a b)))
+
+(define-checked+provide (log [v number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.log v)
+                     (#js.Math.log v)))
 
 (define-checked+provide (exp [w number?])
-  (#js.Math.exp w))
+  (if-scheme-numbers (#js.Core.Number.Scheme.exp w)
+                     (#js.Math.exp w)))
 
 (define-checked+provide (expt [w number?] [z number?])
-  (#js.Math.pow w z))
+  (if-scheme-numbers (#js.Core.Number.Scheme.expt w z)
+                     (#js.Math.pow w z)))
 
 (define-checked+provide (sqrt [v number?])
-  (#js.Math.sqrt v))
+  (if-scheme-numbers (#js.Core.Number.Scheme.sqrt v)
+                     (#js.Math.sqrt v)))
 
 (define-checked+provide (sqr [v number?])
-  (* v v))
+  (if-scheme-numbers (#js.Core.Number.Scheme.sqr v)
+                     (* v v)))
 
 (define-checked+provide (truncate [v number?])
-  (#js.Math.trunc v))
+  (if-scheme-numbers (cond
+                       [(negative? v)
+                        (- (floor v) 1)]
+                       [else (floor v)])
+                     (#js.Math.trunc v)))
 
 (define-checked+provide (remainder [a integer?] [b integer?])
-  (binop % a b))
+  (if-scheme-numbers (#js.Core.Number.Scheme.remainder a b)
+                     (binop % a b)))
 
 (define-checked+provide (number->string [n number?])
   (#js.Core.UString.makeMutable (#js.n.toString)))
 
 ;; TODO: only works for numbers < 32 bits
 (define-checked+provide (arithmetic-shift [n integer?] [m integer?])
-  (if (negative? n)
-      (binop >> n m)
-      (binop << n m)))
+  (if-scheme-numbers (#js.Core.Number.Scheme.arithmeticShift n m)
+                     (if (negative? m)
+                         (binop >> n (- m))
+                         (binop << n m))))
 
 ;;TODO: Support bignums
-(define+provide (inexact->exact x) x)
-(define+provide (exact->inexact x) x)
+(define+provide (inexact->exact v) (if-scheme-numbers (#js.Core.Number.Scheme.toExact v)
+                                                      v))
+(define+provide (exact->inexact v) (if-scheme-numbers (#js.Core.Number.Scheme.toInexact v)
+                                                      v))
 
 ;; complex Numbers
-;; for now, use pair (wont print like Racket)
 (define-checked+provide (make-rectangular [x real?] [y real?])
-  (#js.Core.Pair.make x y))
-
-(define-checked+provide (real-part [z pair?]) #js.z.hd)
-(define-checked+provide (imag-part [z pair?]) #js.z.tl)
-
-;; assume only ints are rational
-(define+provide rational? #js.Number.isInteger)
-(define-checked+provide (numerator [x number?]) x)
-(define-checked+provide (denominator [x number?]) 1)
-
-
+  (if-scheme-numbers (#js.Core.Number.Scheme.makeComplex x y)
+                     (#js.Core.Pair.make x y)))
+
+
+(define-checked+provide (make-polar [m real?] [a real?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.makeComplexPolar m a)
+                     (error "Complex numbers not supported with JS numerber semantics")))
+
+(define-checked+provide (real-part [z (if-scheme-numbers number? pair?)])
+                    (if-scheme-numbers (#js.Core.Number.Scheme.realPart z)
+                                       (#js.z.hd z)))
+(define-checked+provide (imag-part [z (if-scheme-numbers number? pair?)])
+                     (if-scheme-numbers (#js.Core.Number.Scheme.imaginaryPart z)
+                                        (#js.z.tl z)))
+(define-checked+provide/scheme-numbers (magnitude [x number?])
+  (#js.Core.Number.Scheme.magnitude x))
+
+(define-checked+provide/scheme-numbers (conjugate [x number?])
+  (#js.Core.Number.Scheme.conjugate x))
+
+(define-checked+provide/scheme-numbers (angle [x number?])
+  (#js.Core.Number.Scheme.angle x))
+
+(define+provide rational? (if-scheme-numbers #js.Core.Number.Scheme.isRational
+                                             #js.Number.isInteger))
+(define-checked+provide (numerator [x number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.numerator x)
+                     x))
+(define-checked+provide (denominator [x number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.denominator x)
+                     1))
+
+;; bitwise operators
+
+(define+provide bitwise-and
+  (if-scheme-numbers (#js.Core.attachProcedureName
+                      (#js.Core.attachProcedureArity #js.Core.Number.Scheme.bitwiseAnd 1)
+                      "bitwise-and")
+                     (#js.Core.attachProcedureName
+                      (#js.Core.attachProcedureArity #js.Core.Number.JS.bitwiseAnd 1)
+                      "bitwise-and")))
+
+(define+provide bitwise-ior
+  (if-scheme-numbers (#js.Core.attachProcedureName
+                      (#js.Core.attachProcedureArity #js.Core.Number.Scheme.bitwiseOr 1)
+                      "bitwise-ior")
+                     (#js.Core.attachProcedureName
+                      (#js.Core.attachProcedureArity #js.Core.Number.JS.bitwiseOr 1)
+                      "bitwise-ior")))
+
+(define+provide bitwise-xor
+  (if-scheme-numbers (#js.Core.attachProcedureName
+                      (#js.Core.attachProcedureArity #js.Core.Number.Scheme.bitwiseXor 1)
+                      "bitwise-xor")
+                     (#js.Core.attachProcedureName
+                      (#js.Core.attachProcedureArity #js.Core.Number.JS.bitwiseXor 1)
+                      "bitwise-xor")))
+
+(define-checked+provide (bitwise-not [v number?])
+  (if-scheme-numbers (#js.Core.Number.Scheme.bitwiseNot v)
+                     (#js.Core.Number.JS.bitwiseNot v)))
+
+(define+provide (bitwise-bit-set? n m)
+  (not (zero? (bitwise-and n (arithmetic-shift 1 m)))))
 ;; ----------------------------------------------------------------------------
 ;; Booleans
 
@@ -351,7 +553,10 @@
 
 ;; v is optional
 (define-checked+provide (make-vector [size integer?] [v #t])
-  (#js.Core.Vector.makeInit size (or v 0)))
+  (#js.Core.Vector.makeInit size
+    (if (eq? v *undefined*)
+      0
+      v)))
 
 (define+provide vector? #js.Core.Vector.check)
 
@@ -373,6 +578,16 @@
 (define-checked+provide (vector->immutable-vector [vec vector?])
   (#js.Core.Vector.copy vec #f))
 
+(define-checked+provide (vector-copy [vec vector?])
+  (#js.Core.Vector.copy vec #t)) ; a vector copy is always mutable
+
+(define-checked+provide (vector-copy! [dest vector?]
+                                      [dest-start integer?]
+                                      [src vector?]
+                                      [src-start integer?]
+                                      [src-end integer?])
+  (#js.dest.copy dest-start src src-start src-end))
+
 ;; --------------------------------------------------------------------------
 ;; Hashes
 
@@ -780,7 +995,7 @@
        (apply fprintf out form args)
        (get-output-string out)))
 
-(define+provide symbol? #js.Core.Symbol.check)
+(define+provide symbol? #js.Core.PrimitiveSymbol.check)
 (define+provide keyword? #js.Core.Keyword.check)
 
 (define+provide (make-string k [c #\nul])
@@ -788,6 +1003,8 @@
 
 (define+provide (list->string lst)
   (#js.Kernel.listToString lst))
+(define+provide (string->list [str string?])
+  (#js.Core.Pair.listFromArray (#js.Core.UString.toArray str)))
 
 (define+provide (string->immutable-string [s string?])
   (#js.Core.UString.stringToImmutableString s))
@@ -796,33 +1013,44 @@
   (#js.Core.UString.makeMutable (#js.v.toString)))
 
 (define-checked+provide (string->symbol [s string?])
-  (#js.Core.Symbol.make s))
+  (#js.Core.PrimitiveSymbol.make s))
 
 (define-checked+provide (string->uninterned-symbol [s string?])
-  (#js.Core.Symbol.makeUninterned s))
+  (#js.Core.PrimitiveSymbol.makeUninterned s))
 
 ;; TODO: implement unreadable symbols
 (define-checked+provide (string->unreadable-symbol [s string?])
-  (#js.Core.Symbol.make s))
+  (#js.Core.PrimitiveSymbol.make s))
 
 ; Does not support prefixed forms such as "#b101".
 (define+provide (string->number s [radix 10])
   (define (integer-in lo hi)
     (v-λ (v) #:unchecked
-      (and (exact-integer? v) (>= v lo) (<= v hi))))
+         (and (exact-integer? v)
+              (>= v 2)
+              (<= v 16))))
+
   (check/raise string? s 0)
   (check/raise (integer-in 2 16) radix 1)
-  (let ([result (#js*.parseInt s radix)])
-    (if (or (#js*.isNaN result)
-            ; Work around parseInt permissiveness.
-            (not (#js.s.isValidInteger radix)))
-      #f
-      result)))
+
+  (define (js-string->number)
+    (let ([result (#js*.parseInt s radix)])
+      (if (or (#js*.isNaN result)
+              ; Work around parseInt permissiveness.
+              (not (#js.s.isValidInteger radix)))
+          #f
+          result)))
+
+  (if-scheme-numbers
+   (let ([scheme-number (#js.Core.Number.Scheme.fromString s)])
+     (if (and scheme-number
+              (= radix 10))
+         scheme-number
+         (js-string->number)))
+   (js-string->number)))
 
 (define-checked+provide (symbol-interned? [sym symbol?])
-  ;;NOTE: We simply check if given symbol is equal to an
-  ;; interned symbol.
-  (binop === sym (#js.Core.Symbol.make #js.sym.v)))
+  (#js.Core.PrimitiveSymbol.isInterned sym))
 
 (define+provide (symbol=? s v)
   (#js.s.equals v))
@@ -995,6 +1223,8 @@
 (define-property+provide prop:authentic)
 (define-property+provide prop:serialize)
 (define-property+provide prop:custom-write)
+(define-property+provide prop:sealed)
+(define-property+provide prop:object-name)
 
 (define+provide prop:procedure #js.Core.Struct.propProcedure)
 (define+provide prop:equal+hash #js.Core.Struct.propEqualHash)
@@ -1033,12 +1263,21 @@
        (#js.Core.makeOutOfRangeError "bytes-set!" "byte string" bs #js.bs.length i))
       (#js.Core.Bytes.set bs i b)))
 
+(define+provide bytes-append
+  (v-λ bss #:unchecked (#js.Core.Bytes.append bss)))
+
 (define-checked+provide (bytes->string/utf-8 [bs bytes?])
   (#js.Core.UString.fromBytesUtf8 bs))
 
+(define-checked+provide (bytes->string/latin-1 [bs bytes?])
+  (#js.Core.UString.fromBytesLatin1 bs))
+
 (define-checked+provide (string->bytes/utf-8 [str string?])
   (#js.Core.UString.toBytesUtf8 str))
 
+(define+provide (string->bytes/locale str [err-byte #t] [start 0] [end 0])
+  (#js.Core.UString.toBytesUtf8 str))
+
 (define-checked+provide (bytes=? [bstr1 bytes?] [bstr2 bytes?])
   (#js.Core.Bytes.eq bstr1 bstr2))
 
@@ -1172,8 +1411,6 @@
   (v-λ (x n)
        "str" #;(#js.x.toString)))
 
-(define+provide (procedure-arity-mask fn) (procedure-arity fn))
-(define+provide (bitwise-bit-set? mask n) #t)
 (define+provide (procedure-extract-target f) #f)
 
 ;; --------------------------------------------------------------------------
@@ -1199,8 +1436,13 @@
 
 (define+provide byte-pregexp byte-regexp)
 
-(define+provide (regexp-match pattern input)
-  (#js.Core.Regexp.match pattern input))
+(define+provide (regexp-match pattern input [start-pos 0] [end-pos #f])
+  (#js.Core.Regexp.match pattern input start-pos end-pos))
+
+(define+provide (regexp-match? pattern input [start-pos 0] [end-pos #f])
+  (if (#js.Core.Regexp.match pattern input start-pos end-pos)
+      #t
+      #f))
 
 ;; --------------------------------------------------------------------------
 ;; Procedures
@@ -1248,6 +1490,14 @@
                    (kernel:arity-at-least? v)))
              v)))
 
+(define+provide (procedure-arity-mask fn)
+  (let ([ar (procedure-arity fn)])
+    (cond
+      [(integer? ar)
+       (arithmetic-shift 1 ar)]
+      [(kernel:arity-at-least? ar)
+       (arithmetic-shift -1 (kernel:arity-at-least-value ar))])))
+
 (define+provide (checked-procedure-check-and-extract type v proc v1 v2)
   (cond
     [(and (#js.Core.Struct.check v type)
@@ -1265,12 +1515,15 @@
   (v-λ (sym) #:unchecked
     (let ([s (or (and sym #js.sym.v) "")])
       (set! __count (binop + __count 1))
-      (#js.Core.Symbol.makeUninterned (binop + s __count)))))
+      (#js.Core.PrimitiveSymbol.makeUninterned (binop + s __count)))))
 
 (define+provide (eval-jit-enabled) #f)
 
 (define+provide (variable-reference-constant? x) #f)
 (define+provide (variable-reference-from-unsafe? x) #f)
+(define+provide (variable-reference->module-source x) #f)
+(define+provide (variable-reference->resolved-module-path x) #f)
+(define+provide (module-name-fixup x) #f)
 
 (define+provide (inspector? p)
   #t)
@@ -1279,7 +1532,7 @@
 
 (define __count 1000)
 
-(define+provide (system-type mode)
+(define+provide (system-type [mode 'os])
   (case mode
     [(os) 'unix]
     [(vm) 'javascript]
@@ -1287,6 +1540,12 @@
     [(fs-change) (#js.Core.Vector.make (array #false #false #false #false) #false)]
     [else #false])
   )
+
+;; path stubs
+(define+provide (find-system-path kind)  "")
+(define+provide build-path ; multi-arity
+  (v-λ (base) #:unchecked base))
+
 ;; TODO: manually implement weak references? or ES6 WeakMap? see pr#106
 (define+provide make-weak-hash make-hash)
 (define+provide make-weak-hasheqv make-hasheqv)
@@ -1312,6 +1571,12 @@
 
 (define+provide (datum-intern-literal v) v)
 
+;; semaphore stubs
+(define+provide (make-semaphore x) x)
+(define+provide (semaphore-peek-evt x) x)
+(define+provide call-with-semaphore
+  (v-λ (s f) #:unchecked #f))
+
 ;; ----------------------------------------------------------------------------
 ;; Syntax
 
diff --git a/racketscript-compiler/racketscript/compiler/runtime/runtime.rkt b/racketscript-compiler/racketscript/compiler/runtime/runtime.rkt
index 2c247752..c6aa4b85 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/runtime.rkt
+++ b/racketscript-compiler/racketscript/compiler/runtime/runtime.rkt
@@ -4,6 +4,7 @@
          "lib.rkt")
 
 ;; TODO: why does this need to be here and in kernel.rkt?
+;; Because the compiler hangs if it isn't here.
 (define+provide values
   (v-λ vals
     (if (binop === #js.vals.length 1)
diff --git a/racketscript-compiler/racketscript/compiler/runtime/unsafe.rkt b/racketscript-compiler/racketscript/compiler/runtime/unsafe.rkt
index 0ae90929..db8cc125 100644
--- a/racketscript-compiler/racketscript/compiler/runtime/unsafe.rkt
+++ b/racketscript-compiler/racketscript/compiler/runtime/unsafe.rkt
@@ -2,11 +2,11 @@
 
 (require (for-syntax syntax/parse)
          racketscript/interop
+         racketscript/compiler/directive
          "lib.rkt")
 
 (define Core   ($/require/* "./core.js"))
 
-
 ;;-----------------------------------------------------------------------------
 ;; Unsafe Numeric Operations
 
@@ -107,6 +107,15 @@
 (define+provide (unsafe-vector-length v)
   (#js.v.length))
 
+(define+provide (unsafe-vector*-ref v k)
+  (#js.v.ref k))
+
+(define+provide (unsafe-vector*-set! v k val)
+  (#js.v.set k val))
+
+(define+provide (unsafe-vector*-length v)
+  (#js.v.length))
+
 ;;-----------------------------------------------------------------------------
 ;; Hash
 (define+provide (unsafe-immutable-hash-iterate-first h)
@@ -156,3 +165,8 @@
 
 (define+provide (unsafe-root-continuation-prompt-tag)
   (#js.Core.Marks.defaultContinuationPromptTag))
+
+;; strings
+(define+provide (unsafe-string-length s)
+  #js.s.length)
+
diff --git a/racketscript-compiler/racketscript/compiler/transform.rkt b/racketscript-compiler/racketscript/compiler/transform.rkt
index 4c85c976..e0552e3e 100644
--- a/racketscript-compiler/racketscript/compiler/transform.rkt
+++ b/racketscript-compiler/racketscript/compiler/transform.rkt
@@ -315,6 +315,17 @@
                         (ILAssign id v)))
              (ILValue (void)))]
 
+    [(PlainApp (ImportedIdent '#%rs-compiler _ _) args)
+     (match args
+       [(list (Quote 'if-scheme-numbers) consequent alternate)
+        (if (use-scheme-numbers?)
+            (absyn-expr->il consequent #f)
+            (absyn-expr->il alternate #f))]
+       [(list (Quote 'if-scheme-numbers) consequent)
+        (if (use-scheme-numbers?)
+            (absyn-expr->il consequent #f)
+            (values '() (ILValue (void))))]
+       [else (error 'absyn-expr->il "unknown RS compiler directive" args)])]
     [(PlainApp (ImportedIdent '#%js-ffi _ _) args)
      (match args
        [(list (Quote 'var) (Quote var))
@@ -421,16 +432,18 @@
      (define (il-app/binop v arg*)
        (define v-il (let-values ([(_ v) (absyn-expr->il v #f)])
                       v))
-       (cond
-         [(and (equal? v (ImportedIdent '- '#%kernel #t))
-               (length=? arg* 1))
-          (ILApp v-il arg*)]
-         [(and (equal? v (ImportedIdent '/ '#%kernel #t))
-               (length=? arg* 1))
-          (ILBinaryOp '/ (cons (ILValue 1) arg*))]
-         [(and (ImportedIdent? v) (member v binops) (>= (length arg* ) 2))
-          (ILBinaryOp (ImportedIdent-id v) arg*)]
-         [else (ILApp v-il arg*)]))
+       (if (use-scheme-numbers?)
+           (ILApp v-il arg*)
+           (cond
+             [(and (equal? v (ImportedIdent '- '#%kernel #t))
+                   (length=? arg* 1))
+              (ILApp v-il arg*)]
+             [(and (equal? v (ImportedIdent '/ '#%kernel #t))
+                   (length=? arg* 1))
+              (ILBinaryOp '/ (cons (ILValue 1) arg*))]
+             [(and (ImportedIdent? v) (member v binops) (>= (length arg* ) 2))
+              (ILBinaryOp (ImportedIdent-id v) arg*)]
+             [else (ILApp v-il arg*)])))
 
      ;; If some arguements produce statement, it may have side effects
      ;; and hence lambda expression should be computed first.
@@ -606,25 +619,33 @@
              (cons (ILVarDec result-id v)
                    binding-stms))]))
 
-
 (: absyn-value->il (-> Any ILExpr))
 (define (absyn-value->il d)
+  ;; Order here matters. For example, a list is always a cons
+  ;; but a cons is not always a list.
   (cond
     [(Quote? d) (absyn-value->il (Quote-datum d))]
     [(string? d)
      (ILApp (name-in-module 'core 'UString.make)
             (list (ILValue d)))]
     [(symbol? d)
-     (ILApp (name-in-module 'core 'Symbol.make)
+     (ILApp (name-in-module 'core 'PrimitiveSymbol.make)
             (list (ILValue (symbol->string d))))]
+    [(and (complex? d)
+          (not (real? d)))
+     (if (use-scheme-numbers?)
+         (ILApp (name-in-module 'core 'Number.Scheme.makeComplex)
+                (list (absyn-value->il (real-part d))
+                      (absyn-value->il (imag-part d))))
+         (error (~a "Complex numbers not supported with JS number semantics: " d)))]
     [(keyword? d)
      (ILApp (name-in-module 'core 'Keyword.make)
             (list (ILValue (keyword->string d))))]
+    [(empty? d)
+     (name-in-module 'core 'Pair.EMPTY)]
     [(list? d)
      (ILApp (name-in-module 'core 'Pair.makeList)
             (map absyn-value->il d))]
-    [(empty? d)
-     (name-in-module 'core 'Pair.EMPTY)]
     [(cons? d)
      (ILApp (name-in-module 'core 'Pair.make)
             (list (absyn-value->il (car d))
@@ -658,13 +679,19 @@
     [(char? d)
      (ILApp (name-in-module 'core 'Char.charFromCodepoint)
             (list (absyn-value->il (char->integer d))))]
-    [(or (integer? d)
+    [(or (regexp? d) (byte-regexp? d))
+     (define v (object-name d)) ; string or bytes
+     (ILApp (name-in-module 'core 'Regexp.fromString)
+            (list (ILValue (if (bytes? v) (bytes->string/utf-8 v) v))))]
+    [(or (exact-integer? d)
          (boolean? d)
-         (regexp? d)
-         (byte-regexp? d)
-         (void? d)
-         (real? d))
+         (void? d))
      (ILValue d)]
+    [(real? d)
+     (if (use-scheme-numbers?)
+         (ILApp (name-in-module 'core 'Number.Scheme.makeFloat)
+                (list (ILValue d)))
+         (ILValue d))]
     [else (error (~a "unsupported value" d))]))
 
 (: expand-normal-case-lambda (-> (Listof PlainLambda)
@@ -894,7 +921,7 @@
   (: ~sym (-> Symbol ILExpr))
   (define (~sym s)
     (ILApp
-     (name-in-module 'core 'Symbol.make) (list (ILValue (symbol->string s)))))
+     (name-in-module 'core 'PrimitiveSymbol.make) (list (ILValue (symbol->string s)))))
 
   (: ~cons (-> ILExpr ILExpr ILExpr))
   (define (~cons a b)
@@ -1002,7 +1029,9 @@
                          (list (ILVarDec 'if_res1 (~sym 'yes)))
                          (list (ILVarDec 'if_res1 (~sym 'false))))
                    (ILVarDec 'a 'if_res1)
-                   (ILVarDec 'b (ILBinaryOp '+ (list (~val 1) (~val 2)))))
+                   (ILVarDec 'b (if (use-scheme-numbers?)
+                                    (ILApp (ILRef 'kernel '+) (list (ILValue 1) (ILValue 2)))
+                                    (ILBinaryOp '+ (list (~val 1) (~val 2))))))
                   (ILApp 'list '(a b))))
 
   ;; --------------------------------------------------------------------------
@@ -1016,14 +1045,19 @@
                   (ILApp (ILRef 'kernel '/) '()))
     (check-ilexpr (PlainApp (kident '+) (list (Quote 1) (Quote 2)))
                   '()
-                  (ILBinaryOp '+ (list (ILValue 1) (ILValue 2))))
+                  (if (use-scheme-numbers?)
+                      (ILApp (ILRef 'kernel '+) (list (ILValue 1) (ILValue 2)))
+                      (ILBinaryOp '+ (list (ILValue 1) (ILValue 2)))))
     (check-ilexpr (PlainApp (kident '-) (list (Quote 1)
                                               (Quote 2)
                                               (Quote 3)))
                   '()
-                  (ILBinaryOp '-
-                              (list
-                               (ILValue 1) (ILValue 2) (ILValue 3)))))
+                  (if (use-scheme-numbers?)
+                      (ILApp (ILRef 'kernel '-)
+                             (list (ILValue 1) (ILValue 2) (ILValue 3)))
+                      (ILBinaryOp '-
+                                  (list
+                                   (ILValue 1) (ILValue 2) (ILValue 3))))))
 
   ;; --------------------------------------------------------------------------
 
diff --git a/racketscript-compiler/racketscript/compiler/util-untyped.rkt b/racketscript-compiler/racketscript/compiler/util-untyped.rkt
index da3c7e28..1695c32c 100644
--- a/racketscript-compiler/racketscript/compiler/util-untyped.rkt
+++ b/racketscript-compiler/racketscript/compiler/util-untyped.rkt
@@ -5,7 +5,8 @@
          *jsident-pattern*
          js-identifier?)
 
-(require setup/dirs
+(require (for-syntax syntax/parse)
+         setup/dirs
          setup/link)
 
 ;; Path Path -> Boolean
diff --git a/racketscript-compiler/racketscript/interop.rkt b/racketscript-compiler/racketscript/interop.rkt
index 6b3f4c02..8796e7c8 100644
--- a/racketscript-compiler/racketscript/interop.rkt
+++ b/racketscript-compiler/racketscript/interop.rkt
@@ -12,7 +12,9 @@
          $/:=
          $/throw
          $/undefined
+         $/defined?
          $/null
+         $/null?
          $/typeof
          $/instanceof
          $/arguments
@@ -32,12 +34,11 @@
          for/js-object
          js-object?)
 
-(require (for-syntax (for-template "private/interop.rkt")
-                     racket/base
+(require (for-syntax racket/base
                      racket/string
                      syntax/stx
-                     threading
-                     "private/interop.rkt")
+                     threading)
+         "private/interop.rkt"
          syntax/parse/define)
 
 (begin-for-syntax
@@ -102,10 +103,20 @@
   (syntax-parse stx
     [_ #`(#%js-ffi 'undefined)]))
 
+;; shorthand for testing if something is undefined
+(define-syntax ($/defined? stx)
+  (syntax-parse stx
+    [(_ x) #'($/binop !== x $/undefined)]))
+
 (define-syntax ($/null stx)
   (syntax-parse stx
     [_ #`(#%js-ffi 'null)]))
 
+;; shorthand for testing null
+(define-syntax ($/null? stx)
+  (syntax-parse stx
+    [(_ x) #'($/binop === x $/null)]))
+
 (define-syntax ($/this stx)
   (syntax-parse stx
     [_ #`(#%js-ffi 'this)]))
diff --git a/racketscript-compiler/racketscript/lang/reader.rkt b/racketscript-compiler/racketscript/lang/reader.rkt
new file mode 100644
index 00000000..bfa2e428
--- /dev/null
+++ b/racketscript-compiler/racketscript/lang/reader.rkt
@@ -0,0 +1,6 @@
+#lang s-exp syntax/module-reader
+racketscript
+
+#:read x-read
+#:read-syntax x-read-syntax
+(require "../boot/lang/reader.rkt")
diff --git a/racketscript-compiler/racketscript/private/interop.rkt b/racketscript-compiler/racketscript/private/interop.rkt
index 2ae15788..224f6d9f 100644
--- a/racketscript-compiler/racketscript/private/interop.rkt
+++ b/racketscript-compiler/racketscript/private/interop.rkt
@@ -15,6 +15,12 @@
   ;;   + 'object
   ;;   + 'array
   ;;   + 'require
+  ;;   + 'this
+  ;;   + 'typeof
+  ;;   + 'instanceof
+  ;;   + 'string
+  ;;   + 'arguments
+  ;;   + 'operator
   (define-values (#%js-ffi)
     (lambda _
       (#%app error 'racketscript "can't make JS ffi calls in Racket"))))
diff --git a/racketscript-extras/racketscript/htdp/image.rkt b/racketscript-extras/racketscript/htdp/image.rkt
index 8d30aba6..e5db9547 100644
--- a/racketscript-extras/racketscript/htdp/image.rkt
+++ b/racketscript-extras/racketscript/htdp/image.rkt
@@ -124,18 +124,6 @@
 (define (image-height i)  #js.i.height)
 (define (image-width i)   #js.i.width)
 
-(define-proto EmptyScene
-  (λ (width height borders?)
-    #:with-this this
-    (set-object! this
-                 [type      "empty-scene"]
-                 [width     width]
-                 [height    height]
-                 [borders?  borders?]))
-  [render (λ (ctx x y)
-            ;; TODO: borders?
-            (void))])
-
 (define-proto Text
   (λ (text size color face family style weight underline?)
     #:with-this this
@@ -280,8 +268,10 @@
              (#js.ctx.lineTo (posn-x pt) (posn-y pt))
              (loop (cdr points)))))))])
 
-(define (empty-scene width height)
-  (new (EmptyScene width height #f)))
+(define (empty-scene width height [color "white"])
+    (overlay
+        (rectangle width height "solid" color)
+        (rectangle width height "outline" "black")))
 
 (define (text txt size color)
   (new (Text txt
diff --git a/racketscript-extras/racketscript/htdp/private/color.rkt b/racketscript-extras/racketscript/htdp/private/color.rkt
index 04aa28d0..2bec772b 100644
--- a/racketscript-extras/racketscript/htdp/private/color.rkt
+++ b/racketscript-extras/racketscript/htdp/private/color.rkt
@@ -66,6 +66,7 @@
          ["darksalmon" (-color 233 150 122)]
          ["gold" (-color 255 215 0)]
          ["yellow" (-color 255 255 0)]
+         ["medium yellow" (-color 255 255 0)]
          ["olive" (-color 128 128 0)]
          ["burlywood" (-color 222 184 135)]
          ["tan" (-color 210 180 140)]
@@ -206,4 +207,5 @@
          ["darkgray" (-color 169 169 169)]
          ["dim gray" (-color 105 105 105)]
          ["dimgray" (-color 105 105 105)]
-         ["black" (-color 0 0 0)]))
+         ["black" (-color 0 0 0)]
+         ["transparent" (-color 0 0 0 0)]))
diff --git a/racketscript-extras/racketscript/htdp/universe.rkt b/racketscript-extras/racketscript/htdp/universe.rkt
index 7785578b..8bbc9280 100644
--- a/racketscript-extras/racketscript/htdp/universe.rkt
+++ b/racketscript-extras/racketscript/htdp/universe.rkt
@@ -11,6 +11,7 @@
          to-draw
          stop-when
          big-bang
+         name
 
          key=?
          mouse=?)
@@ -64,7 +65,7 @@
      (:= #js.canvas.width   #js.img.width)
      (:= #js.canvas.height  #js.img.height)
 
-     ;; We are reassiging using change-world so that change world
+     ;; We are reassigning using change-world so that change world
      ;; callbacks gets invoked at start of big-bang
      (#js.this.change-world #js.this.world)
 
@@ -93,6 +94,8 @@
    (λ ()
      #:with-this this
      (:= #js.this.-stopped #f)
+     ; always draw first, in case no on-tick handler provided
+     (#js.this.queue-event ($/obj [type #js"to-draw"]))
      (#js.this.process-events))]
   [stop
    (λ ()
@@ -149,9 +152,10 @@
 
           (define changed?
             (cond
-              [handler (#js.handler.invoke #js.this.world evt)]
+              ; raw evt must be checked 1st; bc handler will be undefined
               [(equal? #js.evt.type #js"raw")
                (#js.evt.invoke #js.this.world evt)]
+              [handler (#js.handler.invoke #js.this.world evt)]
               [else
                (#js.console.warn "ignoring unknown/unregistered event type: " evt)]))
           (loop (or world-changed? changed?))]
@@ -379,3 +383,17 @@
   (equal? k1 k2))
 (define (mouse=? m1 m2)
   (equal? m1 m2))
+
+(define (name name)
+  (λ (bb)
+    ($/obj
+      [name        #js"name"]
+      [register
+       (λ ()
+         #:with-this this
+         (:= #js.this.old-title #js*.document.title)
+         (:= #js*.document.title (js-string name)))]
+      [deregister
+       (λ ()
+         #:with-this this
+         (:= #js*.document.title #js.this.old-title))])))
\ No newline at end of file
diff --git a/tests/basic/__complex.rkt b/tests/basic/__complex.rkt
new file mode 100644
index 00000000..a5e5e0c9
--- /dev/null
+++ b/tests/basic/__complex.rkt
@@ -0,0 +1,52 @@
+#lang racket
+
+;; TODO: Make able to test with JS
+;; number semantics.
+(begin (+ 1.0-3i 2.0+1i)
+       (+ 1.0-3i 2.0)
+       (+ 1.0-3i 2)
+       (+ 1.0-3i 1.0+3i)
+       (+ 1.0-3i 1.0+3i 2 5.0)
+       (/ 1-3i 1+3i 2 5)
+       (* 1.0-3i 1.0+3i 2 5.0)
+       (- 1.0-3i 1.0+3i 2 5.0)
+       (add1 1.0-3i)
+       (sub1 1.0-3i)
+       (number? 1.0+1i)
+       (complex? 1.0+1i)
+       (real? 1.0+1i)
+       (rational? 1.0+1i)
+       (integer? 1.0+1i)
+       (zero? 0+0i)
+       (zero? 0-0i)
+       (zero? 1+0i)
+       (exact? 2+1i)
+       (exact? 2.0+1i)
+       (inexact? 2+3i)
+       (inexact? 2.0+3i)
+       (exact->inexact 2+3i)
+       (= 1.0-3i 1.0+3i 2 5.0)
+       (= 1.0-3i 1.0-3i 1.0-3i 1.0-3i )
+       (sqrt -1)
+       (sqrt 100+100i)
+       (expt 2+3i 4)
+       (exp 2+3i)
+       (log 2+3i)
+       (sin 0+0i)
+       (cos 0+0i)
+       (tan 0+0i)
+       (asin (sin 1+1i))
+       (acos (cos 1+1i))
+       (atan 0+0i)
+       (make-rectangular 3 5)
+       (make-polar 3 5)
+       (real-part 3-5i)
+       (imag-part 3-5i)
+       (magnitude 3-5i)
+       (angle 3-5i)
+       (number->string 3-5i)
+       (string->number "3-5i")
+       (conjugate 3-5i)
+       (sinh 3-5i)
+       (cosh 3-5i)
+       (tanh 0+0i))
diff --git a/tests/basic/arithmatic.rkt b/tests/basic/arithmatic.rkt
index e9377a5e..53d88d15 100644
--- a/tests/basic/arithmatic.rkt
+++ b/tests/basic/arithmatic.rkt
@@ -53,3 +53,13 @@
 
 (displayln (+))
 (displayln (*))
+
+;; test bitwise operations
+(displayln (bitwise-and 5 3)) ;; 1
+(displayln (bitwise-and 5 3 -1983)) ;; 1
+(displayln (bitwise-ior 5 3)) ;; 7
+(displayln (bitwise-ior 5 3 10)) ;; 15
+(displayln (bitwise-xor 5 3)) ;; 6
+(displayln (bitwise-xor 5 3 10)) ;; 12
+(displayln (bitwise-not 5)) ;; -6
+(displayln (bitwise-not -3)) ;; 2
diff --git a/tests/basic/for.rkt b/tests/basic/for.rkt
index 976b8541..60cdd486 100644
--- a/tests/basic/for.rkt
+++ b/tests/basic/for.rkt
@@ -5,3 +5,11 @@
     (displayln v)))
 
 (fn (list 1 2 3 4))
+
+;; string sequences
+;; needs unsafe-string-length
+(for ([c "string"])
+  (displayln c))
+
+(for ([c (string->list "string")])
+  (displayln c))
diff --git a/tests/basic/math.rkt b/tests/basic/math.rkt
new file mode 100644
index 00000000..78d01275
--- /dev/null
+++ b/tests/basic/math.rkt
@@ -0,0 +1,9 @@
+#lang racket/base
+(require racket/math)
+
+(displayln (atan 0 -1)) ; pi
+(displayln pi)
+(displayln (sin pi))
+(displayln (acos 0))
+(displayln (asin 0))
+(displayln (atan 0))
diff --git a/tests/basic/protect-out.rkt b/tests/basic/protect-out.rkt
new file mode 100644
index 00000000..2f9ae07e
--- /dev/null
+++ b/tests/basic/protect-out.rkt
@@ -0,0 +1,4 @@
+#lang racket/base
+(define (f x) x)
+(define-for-syntax (f1 x) x)
+(provide (protect-out f (for-meta 1 f1)))
diff --git a/tests/basic/require-provide.rkt b/tests/basic/require-provide.rkt
index baff121c..0e73cfe3 100644
--- a/tests/basic/require-provide.rkt
+++ b/tests/basic/require-provide.rkt
@@ -11,3 +11,6 @@
 (define (sub a b)
   (- a b))
 
+;; require protected id, see pr#284
+(require "protect-out.rkt")
+(displayln (f 10))
diff --git a/tests/basic/string.rkt b/tests/basic/string.rkt
index 816f6eee..01c19d60 100644
--- a/tests/basic/string.rkt
+++ b/tests/basic/string.rkt
@@ -25,6 +25,8 @@
 (displayln (immutable? (string->immutable-string (string #\i #\🎂 #\c))))
 
 (displayln (list->string '(#\a #\🎂 #\c)))
+(displayln (string->list "abc"))
+(displayln (string->list ""))
 (displayln (immutable? (list->string '(#\a #\🎂 #\c))))
 (displayln (string-length (list->string '(#\a #\🎂 #\c))))
 
diff --git a/tests/basic/vector.rkt b/tests/basic/vector.rkt
index fdc96af4..b145e398 100644
--- a/tests/basic/vector.rkt
+++ b/tests/basic/vector.rkt
@@ -21,3 +21,13 @@
 (displayln "equal")
 (displayln (equal? #(1 2 3) #(1 2 3)))
 (displayln (equal? #(1 2 3) #(2 2 3)))
+
+(displayln "make-vector")
+(displayln (make-vector 5))
+(displayln (make-vector 5 3))
+(displayln (make-vector 5 #f))
+(displayln (make-vector 0))
+
+(define vec2 (vector 4 5 6))
+(vector-copy! vec 1 vec2 0 3)
+(displayln vec)
diff --git a/tests/dep-cache/has-dependency.rkt b/tests/dep-cache/has-dependency.rkt
new file mode 100644
index 00000000..52b46b6d
--- /dev/null
+++ b/tests/dep-cache/has-dependency.rkt
@@ -0,0 +1,10 @@
+#lang racket
+
+;; Tests dependecy caching by compiling once, then swapping
+;; the names of ./private/dependency.rkt and ./private/depndency-changed.rkt,
+;; then compiling again. If dependency caching isn't working properly, there
+;; will be an error on the second compilation.
+
+(require "./private/dependency.rkt")
+
+(println (format "~a" (add 5)))
diff --git a/tests/dep-cache/private/dependency.rkt b/tests/dep-cache/private/dependency.rkt
new file mode 100644
index 00000000..ca92c738
--- /dev/null
+++ b/tests/dep-cache/private/dependency.rkt
@@ -0,0 +1,6 @@
+#lang racket
+
+(provide add)
+
+(define (add n)
+  (+ n 2))
diff --git a/tests/ffi/for-array.rkt b/tests/ffi/for-array.rkt
index 6d03360b..5322bc77 100644
--- a/tests/ffi/for-array.rkt
+++ b/tests/ffi/for-array.rkt
@@ -1,4 +1,4 @@
-#lang racketscript/base
+#lang racketscript
 
 (require racketscript/interop)
 
diff --git a/tests/fixture.rkt b/tests/fixture.rkt
index 929589ee..62540626 100755
--- a/tests/fixture.rkt
+++ b/tests/fixture.rkt
@@ -8,7 +8,8 @@
          racketscript/compiler/util
          racketscript/compiler/global
          racketscript/compiler/moddeps
-         racketscript/compiler/il-analyze)
+         racketscript/compiler/il-analyze
+         (for-syntax syntax/parse))
 
 ;; Print Racket and JS output of test programs to stdout
 ;; Also show check failure
@@ -129,19 +130,19 @@
                                  (when (verbose?)
                                    ((error-display-handler) "racket->js failed" e))
                                  #f)])
-      (racket->js)
-      (cond [coverage-mode? (list (list "" "") (list "" ""))]
-            [(js-only?)
-             (define expected-file (path-add-extension fpath ".expected" "."))
-             (define expected
-               (if (file-exists? expected-file)
-                   (file->string expected-file)
-                   ""))
-             (list (list expected "")
-                   (log-and-return 'nodejs (run-in-nodejs fpath)))]
-            [else
-             (list (log-and-return 'racket (run-in-racket fpath))
-                   (log-and-return 'nodejs (run-in-nodejs fpath)))]))))
+      (racket->js))
+    (cond [coverage-mode? (list (list "" "") (list "" ""))]
+          [(js-only?)
+           (define expected-file (path-add-extension fpath ".expected" "."))
+           (define expected
+             (if (file-exists? expected-file)
+                 (file->string expected-file)
+                 ""))
+           (list (list expected "")
+                 (log-and-return 'nodejs (run-in-nodejs fpath)))]
+          [else
+           (list (log-and-return 'racket (run-in-racket fpath))
+                 (log-and-return 'nodejs (run-in-nodejs fpath)))])))
 ;; Path-String -> Void
 ;; Rackunit check for RacketScript. Executes module at file fpath
 ;; in Racket and NodeJS and compare their outputs
@@ -252,53 +253,80 @@
 
   (empty? failed-tests))
 
-
-;; Runs tests with each kind of option
-(define (run tc-search-patterns)
-  (setup)
-  (define passed #t)
-  (define (set-passed! new-value)
-    (set! passed (and passed new-value)))
-
-  (displayln "-> RacketScript Fixtures Runner <-\n")
-  (when coverage-mode? (displayln "Running in coverage mode."))
-
-  (unless coverage-mode?
-    (parameterize ([enabled-optimizations (set)])
-      (displayln "---------------------------------")
-      (displayln "::: Optimizations on ::: none :::")
-      (displayln "---------------------------------")
-      (set-passed! (run-tests (filter-not
-                      (λ (s) (string-contains? s "optimize"))
-                      tc-search-patterns)))))
-
-  ;; (displayln "")
-  ;; (parameterize ([enabled-optimizations (set self-tail->loop)])
-  ;;   (displayln "--------------------------------")
-  ;;   (displayln "::: Optimizations on ::: TCO :::")
-  ;;   (displayln "--------------------------------")
-  ;;   (run-tests tc-search-patterns))
-
-  ;; (displayln "")
-  ;; (parameterize ([enabled-optimizations (set flatten-if-else)])
-  ;;   (displayln "--------------------------------------------")
-  ;;   (displayln "::: Optimizations on ::: Flatten If-Else :::")
-  ;;   (displayln "-------------------------------------------")
-  ;;   (run-tests tc-search-patterns))
-
-  (displayln "")
-  (parameterize ([enabled-optimizations (set flatten-if-else
-                                             self-tail->loop)])
-    (displayln "--------------------------------")
-    (displayln "::: Optimizations on ::: All :::")
-    (displayln "-------------------------------")
-    (set-passed! (run-tests tc-search-patterns)))
-
-  (unless passed (exit 1)))
+(define-syntax (define-test-case stx)
+  (syntax-parse stx
+    [(_ test-name:id
+        (~optional test-desc:string)
+        ([param:id value] ...))
+     #:do [(define test-name-length (syntax-span #'test-name))]
+     #`(define test-name
+         (lambda (paths)
+           (setup)
+           (define passed #t)
+           (define (set-passed! new-value)
+             (set! passed (and passed new-value)))
+
+           (parameterize ([param value] ...)
+             (displayln 'test-name)
+             (displayln (make-string #,test-name-length #\-))
+             (displayln test-desc)
+             (displayln "")
+             (set-passed! (run-tests paths)))
+
+           (displayln "")
+           passed))]))
+
+(define-syntax (run-test-suite stx)
+  (syntax-parse stx
+    [(_ test-case ...+ (~seq #:with paths))
+     #'(and
+         (test-case paths) ...)]
+    [(_ test-case ...+)
+     #'(and
+         (test-case) ...)]))
+
+(define-syntax (fixture-run stx)
+  (define common
+    #'(begin
+        (displayln "")
+        (displayln "-> RacketScript Fixtures Runner <-\n")
+        (when coverage-mode? (displayln "Running in coverage mode."))))
+  (syntax-parse stx
+    [(_ test ...+)
+     #`(begin
+         #,common
+         (unless (andmap (lambda (x) x)
+                         (list test ...))
+           (exit 1)))]))
+
+(define-test-case Baseline
+                "Racket programs without optimization"
+                ([enabled-optimizations (set)]))
+
+(define-test-case Optimized
+                "Racket programs with all optimizations applied"
+                ([enabled-optimizations (set flatten-if-else
+                                             self-tail->loop)]))
+
+(define-test-case Scheme-Numbers
+                "Racket programs using scheme number semantics"
+                ([enabled-optimizations (set)]
+                 [use-scheme-numbers? #t]))
+
+(define-test-case FFI-Baseline
+                "FFI tests without optimization"
+                ([js-only? #t]))
+
+(define-test-case FFI-Optimized
+                "FFI tests with all optimizations applied"
+                ([js-only? #t]
+                 [enabled-optimizations (set flatten-if-else
+                                             self-tail->loop)]))
 
 (module+ main
-  ;; For setup we keep this on by default, and later turned off
+  (define quick? (make-parameter #f))
 
+  ;; For setup we keep this on by default, and later turned off
   (define tc-search-pattern
     (command-line
      #:program "racketscript-fixture"
@@ -311,10 +339,19 @@
      [("-v" "--verbose") "Show exceptions when running tests."
       (racketscript-stdout? #t)
       (verbose? #t)]
+     [("--js-only") "Compare js output against .expected file."
+      (js-only? #t)]
+     [("--quick") "Only run tests with all optimizations applied."
+      (quick? #t)]
      #:args (p . ps*)
      (cons p ps*)))
 
-  (run tc-search-pattern))
+  (fixture-run
+   (run-test-suite (if (quick?)
+                       void
+                       Baseline)
+                   Optimized
+                   #:with tc-search-pattern)))
 
 (module+ test
   (define-runtime-path fixture-module "fixture.rkt")
@@ -323,14 +360,30 @@
   (define (fixture-path-patterns . paths)
     (for/list ([p paths]) (~a (build-path fixture-module-dir p) "/*.rkt")))
 
-  (run (fixture-path-patterns "racket-core"
-                              "test-the-test"
-                              "basic"
-                              "struct"
-                              "hash"
-                              "wcm"
-                              "modules"
-                              "optimize"
-                              "experimental"))
-  (parameterize ([js-only? #t])
-    (run (fixture-path-patterns "ffi"))))
+  (define basic-tests
+    (fixture-path-patterns
+     "racket-core"
+     "test-the-test"
+     "basic"
+     "struct"
+     "hash"
+     "wcm"
+     "modules"
+     "experimental"))
+
+
+  (fixture-run
+
+   (run-test-suite (if coverage-mode?
+                       void
+                       Baseline)
+                   Scheme-Numbers
+                   #:with basic-tests)
+
+   (run-test-suite Optimized
+                   #:with (append basic-tests
+                                  (fixture-path-patterns "optimize")))
+
+   (run-test-suite FFI-Baseline
+                   FFI-Optimized
+                   #:with (fixture-path-patterns "ffi"))))
diff --git a/tests/racket-core/hash.rkt b/tests/racket-core/hash.rkt
index 47fe585a..49bcd32f 100644
--- a/tests/racket-core/hash.rkt
+++ b/tests/racket-core/hash.rkt
@@ -82,8 +82,9 @@
                          #"apple" 'a #"banana" 'b #"coconut" 'c
                          u/apple 'a u/banana 'b u/coconut 'c
                          ;; TODO: properly implement unreadable symbols
+                         'apple 'banana 'coconut 'coconut+
                          ; apple 'a banana 'b coconut 'c
-                         'apple 'a 'banana 'b 'coconut 'c 'coconut+ '+
+                         ;'apple 'a 'banana 'b 'coconut 'c 'coconut+ '+
                          '#:apple 'a '#:banana 'b '#:coconut 'c
                          null 'one
                          (void) 'one
diff --git a/tests/racket-core/rx.rkt b/tests/racket-core/rx.rkt
index 1bd44f6b..24db82f2 100644
--- a/tests/racket-core/rx.rkt
+++ b/tests/racket-core/rx.rkt
@@ -21,27 +21,26 @@
      ;; bytes-string inputs => byte results
      (test result regexp-match (bytes->string/utf-8 pattern) input)]
     [else ; pattern == rx literal
-     ;; TODO: result is always strings for now
-     ;; bc js cannot differentiate between literal regexps and byte-regexps
      (test result regexp-match pattern (bytes->string/utf-8 input))])
-  ;; (test result regexp-match (bytes-append #"(?:" pattern #")") input)
-  ;; (test result regexp-match (bytes-append #"(?:(?:" pattern #"))") input)
-  ;; (test (and result (cons (car result) result)) 
-  ;;       regexp-match (bytes-append #"(?:(" pattern #"))") input)
-  ;; (test result regexp-match (bytes-append #"(?:)" pattern #"") input)
-  ;; (test result regexp-match (bytes-append #"(?<=)" pattern #"") input)
-  ;; (test result regexp-match (bytes-append #"(?:^|(?<=.))" pattern #"") input)
-  ;; (test result regexp-match (bytes-append #"" pattern #"(?=)") input)
-  ;; (test result regexp-match (bytes-append #"" pattern #"(?:$|(?=.))") input)
-  ;; (test (and result (cons (car result) result))
-  ;;       regexp-match (byte-pregexp (bytes-append #"(?=(" pattern #"))\\1")) input)
+  (test result regexp-match (bytes-append #"(?:" pattern #")") input)
+  (test result regexp-match (bytes-append #"(?:(?:" pattern #"))") input)
+  (test (and result (cons (car result) result)) 
+        regexp-match (bytes-append #"(?:(" pattern #"))") input)
+  (test result regexp-match (bytes-append #"(?:)" pattern #"") input)
+  (test result regexp-match (bytes-append #"(?<=)" pattern #"") input)
+  (test result regexp-match (bytes-append #"(?:^|(?<=.))" pattern #"") input)
+  (test result regexp-match (bytes-append #"" pattern #"(?=)") input)
+  (test result regexp-match (bytes-append #"" pattern #"(?:$|(?=.))") input)
+  (test (and result (cons (car result) result))
+        regexp-match (byte-pregexp (bytes-append #"(?=(" pattern #"))\\1")) input)
+  ;; invalid JS Regexp: "Invalid group"
   ;; (test result regexp-match (bytes-append #"(?>" pattern #")") input)
   )
 
 ;; For when adding "x"s to the beginning and end shouldn't change the result:
 (define (test-regexp-x result pattern input)
   (test-regexp result pattern input)
-;  (test-regexp result pattern (bytes-append #"xxx" input #"xxx"))
+  (test-regexp result pattern (bytes-append #"xxx" input #"xxx"))
   )
 
 (test-regexp-x '(#"a") #"a" #"abc")
@@ -147,10 +146,11 @@
 (test-regexp '(#"d") #"q?[ad]" #"d")
 (test-regexp #f #"q?[ad]" #"c")
 
-;; (test '(#"a") regexp-match #rx#"^[^\0]" #"aaa\0")
-;; (test #f regexp-match #rx#"^[^\0]" #"\0aaa\0")
-;; (test '(#"aaa") regexp-match #rx#"^[^\0]*" #"aaa\0")
+(test '(#"a") regexp-match #rx#"^[^\0]" #"aaa\0")
+(test #f regexp-match #rx#"^[^\0]" #"\0aaa\0")
+(test '(#"aaa") regexp-match #rx#"^[^\0]*" #"aaa\0")
 
+;; this is testing err msg, but they will be different since we use js Regexp
 ;; (map (lambda (t)
 ;;        (err/rt-test (byte-pregexp t))
 ;;        (err/rt-test (pregexp t)))
@@ -270,161 +270,165 @@
 ;; 	       sigmas lambdas))
 ;; 	    sigmas))
 
-;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; ;; Most of the following tests are derived from "testinput" in 
-;; ;; CL-PPCRE, which probably is from Perl originally. 
-;; ;; The tests have been modified to avoid various incompatibilities.
+;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Most of the following tests are derived from "testinput" in 
+;; CL-PPCRE, which probably is from Perl originally. 
+;; The tests have been modified to avoid various incompatibilities.
 
-;; (define (make-reluctant-port bstr)
-;;   ;; Handing out a single character at a time stresses
-;;   ;; the regexp matcher's lazy reading of a port:
-;;   (define pos 0)
-;;   (define len (bytes-length bstr))
-;;   (make-input-port
-;;    'reluctant-bytes
-;;    (lambda (s)
-;;      (if (pos . >= . len)
-;;          eof
-;;          (begin
-;;            (bytes-set! s 0 (bytes-ref bstr pos))
-;;            (set! pos (add1 pos))
-;;            1)))
-;;    (lambda (s skip evt)
-;;      (if ((+ pos skip) . >= . len)
-;;          eof
-;;          (begin
-;;            (bytes-set! s 0 (bytes-ref bstr (+ pos skip)))
-;;            1)))
-;;    void))
+(define (make-reluctant-port bstr)
+  ;; Handing out a single character at a time stresses
+  ;; the regexp matcher's lazy reading of a port:
+  (define pos 0)
+  (define len (bytes-length bstr))
+  (make-input-port
+   'reluctant-bytes
+   (lambda (s)
+     (if (pos . >= . len)
+         eof
+         (begin
+           (bytes-set! s 0 (bytes-ref bstr pos))
+           (set! pos (add1 pos))
+           1)))
+   (lambda (s skip evt)
+     (if ((+ pos skip) . >= . len)
+         eof
+         (begin
+           (bytes-set! s 0 (bytes-ref bstr (+ pos skip)))
+           1)))
+   void))
 
-;; (map (lambda (t)
-;;        (if (pair? t)
-;; 	   (begin
-;; 	     (test (caddr t) regexp-match (byte-pregexp (car t)) (cadr t))
-;; 	     (test (caddr t) regexp-match (byte-pregexp (car t)) (bytes-append #"xxxxxxxxxx" (cadr t)) 10)
-;; 	     (test (caddr t) regexp-match (byte-pregexp (car t)) (bytes-append (cadr t) #"xxxxxxxxxx") 0 (bytes-length (cadr t)))
-;; 	     (test (caddr t) regexp-match (byte-pregexp (car t)) (open-input-bytes (cadr t)))
-;; 	     (test (caddr t) regexp-match (byte-pregexp (car t)) (make-reluctant-port (cadr t)))
-;; 	     (test (and (caddr t)
-;; 			(map (lambda (v)
-;; 			       (and v (bytes->string/latin-1 v)))
-;; 			     (caddr t)))
-;; 		   regexp-match 
-;; 		   (pregexp (bytes->string/latin-1 (car t)))
-;; 		   (bytes->string/latin-1 (cadr t)))
-;; 	     (test (and (caddr t)
-;; 			(map (lambda (v)
-;; 			       (and v (string->bytes/utf-8 (bytes->string/latin-1 v))))
-;; 			     (caddr t)))
-;; 		   regexp-match 
-;; 		   (pregexp (bytes->string/latin-1 (car t)))
-;; 		   (open-input-string (bytes->string/latin-1 (cadr t)))))
-;; 	   (begin
-;; 	     (err/rt-test (byte-pregexp t))
-;; 	     (err/rt-test (pregexp (bytes->string/latin-1 t))))))
-;;      '(#"}"
+(map (lambda (t)
+       (if (pair? t)
+	   (begin
+ 	     (test (caddr t) regexp-match (byte-pregexp (car t)) (cadr t))
+	     (test (caddr t) regexp-match (byte-pregexp (car t)) (bytes-append #"xxxxxxxxxx" (cadr t)) 10)
+	     (test (caddr t) regexp-match (byte-pregexp (car t)) (bytes-append (cadr t) #"xxxxxxxxxx") 0 (bytes-length (cadr t)))
+	     ;; (test (caddr t) regexp-match (byte-pregexp (car t)) (open-input-bytes (cadr t)))
+	     ;; (test (caddr t) regexp-match (byte-pregexp (car t)) (make-reluctant-port (cadr t)))
+	     ;; (test (and (caddr t)
+	     ;;    	(map (lambda (v)
+	     ;;    	       (and v (bytes->string/latin-1 v)))
+	     ;;    	     (caddr t)))
+	     ;;       regexp-match 
+	     ;;       (pregexp (bytes->string/latin-1 (car t)))
+	     ;;       (bytes->string/latin-1 (cadr t)))
+	     ;; (test (and (caddr t)
+	     ;;    	(map (lambda (v)
+	     ;;    	       (and v (string->bytes/utf-8 (bytes->string/latin-1 v))))
+	     ;;    	     (caddr t)))
+	     ;;       regexp-match 
+	     ;;       (pregexp (bytes->string/latin-1 (car t)))
+             ;; 		   (open-input-string (bytes->string/latin-1 (cadr t))))
+             )
+           ;; err cases, dont test these
+	   (begin
+ 	     (err/rt-test (byte-pregexp t))
+             (err/rt-test (pregexp (bytes->string/latin-1 t)))
+             )))
+           '(;#"}"
 ;;        #"]"
 ;;        #"[a[:alph:]b]"
-;;        (#"the quick brown fox" #"the quick brown fox" (#"the quick brown fox"))
-;;        (#"the quick brown fox" #"The quick brown FOX" #f)
-;;        (#"the quick brown fox" #"What do you know about the quick brown fox?" (#"the quick brown fox"))
-;;        (#"the quick brown fox" #"What do you know about THE QUICK BROWN FOX?" #f)
+       (#"the quick brown fox" #"the quick brown fox" (#"the quick brown fox"))
+       (#"the quick brown fox" #"The quick brown FOX" #f)
+       (#"the quick brown fox" #"What do you know about the quick brown fox?" (#"the quick brown fox"))
+       (#"the quick brown fox" #"What do you know about THE QUICK BROWN FOX?" #f)
+;; SyntaxError: Invalid regular expression: /(?i:The quick brown fox)/: Invalid group
 ;;        (#"(?i:The quick brown fox)" #"the quick brown fox" (#"the quick brown fox"))
 ;;        (#"(?i:The quick brown fox)" #"The quick brown FOX" (#"The quick brown FOX"))
 ;;        (#"(?i:The quick brown fox)" #"What do you know about the quick brown fox?" (#"the quick brown fox"))
 ;;        (#"(?i:The quick brown fox)" #"What do you know about THE QUICK BROWN FOX?" (#"THE QUICK BROWN FOX"))
-;;        (#"abcd\t\n\r\f\a\e\071\x3b\\$\\\\\\?caxyz" #"abcd\t\n\r\f\a\e9;$\\?caxyz" (#"abcd\t\n\r\f\a\e9;$\\?caxyz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrabbxyyyypqAzz" (#"abxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrabbxyyyypqAzz" (#"abxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabxyzpqrrrabbxyyyypqAzz" (#"aabxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabxyzpqrrrabbxyyyypqAzz" (#"aaabxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabxyzpqrrrabbxyyyypqAzz" (#"aaaabxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abcxyzpqrrrabbxyyyypqAzz" (#"abcxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabcxyzpqrrrabbxyyyypqAzz" (#"aabcxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypAzz" (#"aaabcxyzpqrrrabbxyyyypAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqAzz" (#"aaabcxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqqqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqqqqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzpqrrrabbxyyyypqAzz" (#"aaaabcxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzzpqrrrabbxyyyypqAzz" (#"abxyzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabxyzzzpqrrrabbxyyyypqAzz" (#"aabxyzzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabxyzzzzpqrrrabbxyyyypqAzz" (#"aaabxyzzzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabxyzzzzpqrrrabbxyyyypqAzz" (#"aaaabxyzzzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abcxyzzpqrrrabbxyyyypqAzz" (#"abcxyzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabcxyzzzpqrrrabbxyyyypqAzz" (#"aabcxyzzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzzzzpqrrrabbxyyyypqAzz" (#"aaabcxyzzzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbxyyyypqAzz" (#"aaaabcxyzzzzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyyypqAzz" (#"aaaabcxyzzzzpqrrrabbbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyyyypqAzz" (#"aaaabcxyzzzzpqrrrabbbxyyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypABzz" (#"aaabcxyzpqrrrabbxyyyypABzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypABBzz" (#"aaabcxyzpqrrrabbxyyyypABBzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #">>>aaabxyzpqrrrabbxyyyypqAzz" (#"aaabxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #">aaaabxyzpqrrrabbxyyyypqAzz" (#"aaaabxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #">>>>abcxyzpqrrrabbxyyyypqAzz" (#"abcxyzpqrrrabbxyyyypqAzz"))
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrabbxyyyypqAzz" #f)
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrrabbxyyyypqAzz" #f)
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrabxyyyypqAzz" #f)
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyyyyypqAzz" #f)
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyypqAzz" #f)
-;;        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqqqqAzz" #f)
-;;        (#"^(abc){1,2}zz" #"abczz" (#"abczz" #"abc"))
-;;        (#"^(abc){1,2}zz" #"abcabczz" (#"abcabczz" #"abc"))
-;;        (#"^(abc){1,2}zz" #"zz" #f)
-;;        (#"^(abc){1,2}zz" #"abcabcabczz" #f)
-;;        (#"^(abc){1,2}zz" #">>abczz" #f)
-;;        (#"^(b+?|a){1,2}?c" #"bc" (#"bc" #"b"))
-;;        (#"^(b+?|a){1,2}?c" #"bbc" (#"bbc" #"b"))
-;;        (#"^(b+?|a){1,2}?c" #"bbbc" (#"bbbc" #"bb"))
-;;        (#"^(b+?|a){1,2}?c" #"bac" (#"bac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"bbac" (#"bbac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"aac" (#"aac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"abbbbbbbbbbbc" (#"abbbbbbbbbbbc" #"bbbbbbbbbbb"))
-;;        (#"^(b+?|a){1,2}?c" #"bbbbbbbbbbbac" (#"bbbbbbbbbbbac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"aaac" #f)
-;;        (#"^(b+?|a){1,2}?c" #"abbbbbbbbbbbac" #f)
-;;        (#"^(b+|a){1,2}c" #"bc" (#"bc" #"b"))
-;;        (#"^(b+|a){1,2}c" #"bbc" (#"bbc" #"bb"))
-;;        (#"^(b+|a){1,2}c" #"bbbc" (#"bbbc" #"bbb"))
-;;        (#"^(b+|a){1,2}c" #"bac" (#"bac" #"a"))
-;;        (#"^(b+|a){1,2}c" #"bbac" (#"bbac" #"a"))
-;;        (#"^(b+|a){1,2}c" #"aac" (#"aac" #"a"))
-;;        (#"^(b+|a){1,2}c" #"abbbbbbbbbbbc" (#"abbbbbbbbbbbc" #"bbbbbbbbbbb"))
-;;        (#"^(b+|a){1,2}c" #"bbbbbbbbbbbac" (#"bbbbbbbbbbbac" #"a"))
-;;        (#"^(b+|a){1,2}c" #"aaac" #f)
-;;        (#"^(b+|a){1,2}c" #"abbbbbbbbbbbac" #f)
-;;        (#"^(b+|a){1,2}?bc" #"bbc" (#"bbc" #"b"))
+        (#"abcd\t\n\r\f\a\e\071\x3b\\$\\\\\\?caxyz" #"abcd\t\n\r\f\a\e9;$\\?caxyz" (#"abcd\t\n\r\f\a\e9;$\\?caxyz"))
+        (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrabbxyyyypqAzz" (#"abxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrabbxyyyypqAzz" (#"abxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabxyzpqrrrabbxyyyypqAzz" (#"aabxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabxyzpqrrrabbxyyyypqAzz" (#"aaabxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabxyzpqrrrabbxyyyypqAzz" (#"aaaabxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abcxyzpqrrrabbxyyyypqAzz" (#"abcxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabcxyzpqrrrabbxyyyypqAzz" (#"aabcxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypAzz" (#"aaabcxyzpqrrrabbxyyyypAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqAzz" (#"aaabcxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqqqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqqqAzz" (#"aaabcxyzpqrrrabbxyyyypqqqqqqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzpqrrrabbxyyyypqAzz" (#"aaaabcxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzzpqrrrabbxyyyypqAzz" (#"abxyzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabxyzzzpqrrrabbxyyyypqAzz" (#"aabxyzzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabxyzzzzpqrrrabbxyyyypqAzz" (#"aaabxyzzzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabxyzzzzpqrrrabbxyyyypqAzz" (#"aaaabxyzzzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abcxyzzpqrrrabbxyyyypqAzz" (#"abcxyzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aabcxyzzzpqrrrabbxyyyypqAzz" (#"aabcxyzzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzzzzpqrrrabbxyyyypqAzz" (#"aaabcxyzzzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbxyyyypqAzz" (#"aaaabcxyzzzzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyyypqAzz" (#"aaaabcxyzzzzpqrrrabbbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyyyypqAzz" (#"aaaabcxyzzzzpqrrrabbbxyyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypABzz" (#"aaabcxyzpqrrrabbxyyyypABzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypABBzz" (#"aaabcxyzpqrrrabbxyyyypABBzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #">>>aaabxyzpqrrrabbxyyyypqAzz" (#"aaabxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #">aaaabxyzpqrrrabbxyyyypqAzz" (#"aaaabxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #">>>>abcxyzpqrrrabbxyyyypqAzz" (#"abcxyzpqrrrabbxyyyypqAzz"))
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrabbxyyyypqAzz" #f)
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrrabbxyyyypqAzz" #f)
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"abxyzpqrrrabxyyyypqAzz" #f)
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyyyyypqAzz" #f)
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaaabcxyzzzzpqrrrabbbxyyypqAzz" #f)
+       (#"a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz" #"aaabcxyzpqrrrabbxyyyypqqqqqqqAzz" #f)
+       (#"^(abc){1,2}zz" #"abczz" (#"abczz" #"abc"))
+       (#"^(abc){1,2}zz" #"abcabczz" (#"abcabczz" #"abc"))
+       (#"^(abc){1,2}zz" #"zz" #f)
+       (#"^(abc){1,2}zz" #"abcabcabczz" #f)
+       (#"^(abc){1,2}zz" #">>abczz" #f)
+       (#"^(b+?|a){1,2}?c" #"bc" (#"bc" #"b"))
+       (#"^(b+?|a){1,2}?c" #"bbc" (#"bbc" #"b"))
+       (#"^(b+?|a){1,2}?c" #"bbbc" (#"bbbc" #"bb"))
+       (#"^(b+?|a){1,2}?c" #"bac" (#"bac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"bbac" (#"bbac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"aac" (#"aac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"abbbbbbbbbbbc" (#"abbbbbbbbbbbc" #"bbbbbbbbbbb"))
+       (#"^(b+?|a){1,2}?c" #"bbbbbbbbbbbac" (#"bbbbbbbbbbbac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"aaac" #f)
+       (#"^(b+?|a){1,2}?c" #"abbbbbbbbbbbac" #f)
+       (#"^(b+|a){1,2}c" #"bc" (#"bc" #"b"))
+       (#"^(b+|a){1,2}c" #"bbc" (#"bbc" #"bb"))
+       (#"^(b+|a){1,2}c" #"bbbc" (#"bbbc" #"bbb"))
+       (#"^(b+|a){1,2}c" #"bac" (#"bac" #"a"))
+       (#"^(b+|a){1,2}c" #"bbac" (#"bbac" #"a"))
+       (#"^(b+|a){1,2}c" #"aac" (#"aac" #"a"))
+       (#"^(b+|a){1,2}c" #"abbbbbbbbbbbc" (#"abbbbbbbbbbbc" #"bbbbbbbbbbb"))
+       (#"^(b+|a){1,2}c" #"bbbbbbbbbbbac" (#"bbbbbbbbbbbac" #"a"))
+       (#"^(b+|a){1,2}c" #"aaac" #f)
+       (#"^(b+|a){1,2}c" #"abbbbbbbbbbbac" #f)
+       (#"^(b+|a){1,2}?bc" #"bbc" (#"bbc" #"b"))
 ;;        #"^(b*|ba){1,2}?bc"
-;;        (#"(.)c|ad" #"ad" (#"ad" #f))
-;;        (#"(a)c|ad" #"ad" (#"ad" #f))
-;;        (#"(?<=(a))c|d" #"ad" (#"d" #f))
-;;        (#"(?=(a))ac|ad" #"ad" (#"ad" #f))
-;;        (#"^[ab\\]cde]" #"athing" (#"a"))
-;;        (#"^[ab\\]cde]" #"bthing" (#"b"))
-;;        (#"^[ab\\]cde]" #"]thing" (#"]"))
-;;        (#"^[ab\\]cde]" #"cthing" (#"c"))
-;;        (#"^[ab\\]cde]" #"dthing" (#"d"))
-;;        (#"^[ab\\]cde]" #"ething" (#"e"))
-;;        (#"^[ab\\]cde]" #"fthing" #f)
-;;        (#"^[ab\\]cde]" #"[thing" #f)
-;;        (#"^[ab\\]cde]" #"\\\\thing" #f)
+       (#"(.)c|ad" #"ad" (#"ad" #f))
+       (#"(a)c|ad" #"ad" (#"ad" #f))
+       (#"(?<=(a))c|d" #"ad" (#"d" #f))
+       (#"(?=(a))ac|ad" #"ad" (#"ad" #f))
+       (#"^[ab\\]cde]" #"athing" (#"a"))
+       (#"^[ab\\]cde]" #"bthing" (#"b"))
+       (#"^[ab\\]cde]" #"]thing" (#"]"))
+       (#"^[ab\\]cde]" #"cthing" (#"c"))
+       (#"^[ab\\]cde]" #"dthing" (#"d"))
+       (#"^[ab\\]cde]" #"ething" (#"e"))
+       (#"^[ab\\]cde]" #"fthing" #f)
+       (#"^[ab\\]cde]" #"[thing" #f)
+       (#"^[ab\\]cde]" #"\\\\thing" #f)
 ;;        (#"^[]cde]" #"]thing" (#"]"))
 ;;        (#"^[]cde]" #"cthing" (#"c"))
 ;;        (#"^[]cde]" #"dthing" (#"d"))
 ;;        (#"^[]cde]" #"ething" (#"e"))
-;;        (#"^[]cde]" #"athing" #f)
-;;        (#"^[]cde]" #"fthing" #f)
-;;        (#"^[^ab\\]cde]" #"fthing" (#"f"))
-;;        (#"^[^ab\\]cde]" #"[thing" (#"["))
-;;        (#"^[^ab\\]cde]" #"\\\\thing" (#"\\"))
-;;        (#"^[^ab\\]cde]" #"athing" #f)
-;;        (#"^[^ab\\]cde]" #"bthing" #f)
-;;        (#"^[^ab\\]cde]" #"]thing" #f)
-;;        (#"^[^ab\\]cde]" #"cthing" #f)
-;;        (#"^[^ab\\]cde]" #"dthing" #f)
-;;        (#"^[^ab\\]cde]" #"ething" #f)
+       (#"^[]cde]" #"athing" #f)
+       (#"^[]cde]" #"fthing" #f)
+       (#"^[^ab\\]cde]" #"fthing" (#"f"))
+       (#"^[^ab\\]cde]" #"[thing" (#"["))
+       (#"^[^ab\\]cde]" #"\\\\thing" (#"\\"))
+       (#"^[^ab\\]cde]" #"athing" #f)
+       (#"^[^ab\\]cde]" #"bthing" #f)
+       (#"^[^ab\\]cde]" #"]thing" #f)
+       (#"^[^ab\\]cde]" #"cthing" #f)
+       (#"^[^ab\\]cde]" #"dthing" #f)
+       (#"^[^ab\\]cde]" #"ething" #f)
 ;;        (#"^[^]cde]" #"athing" (#"a"))
 ;;        (#"^[^]cde]" #"fthing" (#"f"))
 ;;        (#"^[^]cde]" #"]thing" #f)
@@ -433,42 +437,43 @@
 ;;        (#"^[^]cde]" #"ething" #f)
 ;;        (#"^\\\201" #"\201" (#"\201"))
 ;;        (#"^\377" #"\377" (#"\377"))
-;;        (#"^[0-9]+$" #"0" (#"0"))
-;;        (#"^[0-9]+$" #"1" (#"1"))
-;;        (#"^[0-9]+$" #"2" (#"2"))
-;;        (#"^[0-9]+$" #"3" (#"3"))
-;;        (#"^[0-9]+$" #"4" (#"4"))
-;;        (#"^[0-9]+$" #"5" (#"5"))
-;;        (#"^[0-9]+$" #"6" (#"6"))
-;;        (#"^[0-9]+$" #"7" (#"7"))
-;;        (#"^[0-9]+$" #"8" (#"8"))
-;;        (#"^[0-9]+$" #"9" (#"9"))
-;;        (#"^[0-9]+$" #"10" (#"10"))
-;;        (#"^[0-9]+$" #"100" (#"100"))
-;;        (#"^[0-9]+$" #"abc" #f)
-;;        (#"^.*nter" #"enter" (#"enter"))
-;;        (#"^.*nter" #"inter" (#"inter"))
-;;        (#"^.*nter" #"uponter" (#"uponter"))
-;;        (#"^xxx[0-9]+$" #"xxx0" (#"xxx0"))
-;;        (#"^xxx[0-9]+$" #"xxx1234" (#"xxx1234"))
-;;        (#"^xxx[0-9]+$" #"xxx" #f)
-;;        (#"^.+[0-9][0-9][0-9]$" #"x123" (#"x123"))
-;;        (#"^.+[0-9][0-9][0-9]$" #"xx123" (#"xx123"))
-;;        (#"^.+[0-9][0-9][0-9]$" #"123456" (#"123456"))
-;;        (#"^.+[0-9][0-9][0-9]$" #"123" #f)
-;;        (#"^.+[0-9][0-9][0-9]$" #"x1234" (#"x1234"))
-;;        (#"^.+?[0-9][0-9][0-9]$" #"x123" (#"x123"))
-;;        (#"^.+?[0-9][0-9][0-9]$" #"xx123" (#"xx123"))
-;;        (#"^.+?[0-9][0-9][0-9]$" #"123456" (#"123456"))
-;;        (#"^.+?[0-9][0-9][0-9]$" #"123" #f)
-;;        (#"^.+?[0-9][0-9][0-9]$" #"x1234" (#"x1234"))
-;;        (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!pqr=apquxz.ixr.zzz.ac.uk" (#"abc!pqr=apquxz.ixr.zzz.ac.uk" #"abc" #"pqr"))
-;;        (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"!pqr=apquxz.ixr.zzz.ac.uk" #f)
-;;        (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!=apquxz.ixr.zzz.ac.uk" #f)
-;;        (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!pqr=apquxz:ixr.zzz.ac.uk" #f)
-;;        (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!pqr=apquxz.ixr.zzz.ac.ukk" #f)
-;;        (#":" #"Well, we need a colon: somewhere" (#":"))
-;;        (#":" #"Fail if we don't" #f)
+       (#"^[0-9]+$" #"0" (#"0"))
+       (#"^[0-9]+$" #"1" (#"1"))
+       (#"^[0-9]+$" #"2" (#"2"))
+       (#"^[0-9]+$" #"3" (#"3"))
+       (#"^[0-9]+$" #"4" (#"4"))
+       (#"^[0-9]+$" #"5" (#"5"))
+       (#"^[0-9]+$" #"6" (#"6"))
+       (#"^[0-9]+$" #"7" (#"7"))
+       (#"^[0-9]+$" #"8" (#"8"))
+       (#"^[0-9]+$" #"9" (#"9"))
+       (#"^[0-9]+$" #"10" (#"10"))
+       (#"^[0-9]+$" #"100" (#"100"))
+       (#"^[0-9]+$" #"abc" #f)
+       (#"^.*nter" #"enter" (#"enter"))
+       (#"^.*nter" #"inter" (#"inter"))
+       (#"^.*nter" #"uponter" (#"uponter"))
+       (#"^xxx[0-9]+$" #"xxx0" (#"xxx0"))
+       (#"^xxx[0-9]+$" #"xxx1234" (#"xxx1234"))
+       (#"^xxx[0-9]+$" #"xxx" #f)
+       (#"^.+[0-9][0-9][0-9]$" #"x123" (#"x123"))
+       (#"^.+[0-9][0-9][0-9]$" #"xx123" (#"xx123"))
+       (#"^.+[0-9][0-9][0-9]$" #"123456" (#"123456"))
+       (#"^.+[0-9][0-9][0-9]$" #"123" #f)
+       (#"^.+[0-9][0-9][0-9]$" #"x1234" (#"x1234"))
+       (#"^.+?[0-9][0-9][0-9]$" #"x123" (#"x123"))
+       (#"^.+?[0-9][0-9][0-9]$" #"xx123" (#"xx123"))
+       (#"^.+?[0-9][0-9][0-9]$" #"123456" (#"123456"))
+       (#"^.+?[0-9][0-9][0-9]$" #"123" #f)
+       (#"^.+?[0-9][0-9][0-9]$" #"x1234" (#"x1234"))
+       (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!pqr=apquxz.ixr.zzz.ac.uk" (#"abc!pqr=apquxz.ixr.zzz.ac.uk" #"abc" #"pqr"))
+       (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"!pqr=apquxz.ixr.zzz.ac.uk" #f)
+       (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!=apquxz.ixr.zzz.ac.uk" #f)
+       (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!pqr=apquxz:ixr.zzz.ac.uk" #f)
+       (#"^([^!]+)!(.+)=apquxz\\.ixr\\.zzz\\.ac\\.uk$" #"abc!pqr=apquxz.ixr.zzz.ac.ukk" #f)
+       (#":" #"Well, we need a colon: somewhere" (#":"))
+       (#":" #"Fail if we don't" #f)
+;; SyntaxError: Invalid regular expression: /(?i:([\da-f:]+)$)/: Invalid group
 ;;        (#"(?i:([\\da-f:]+)$)" #"0abc" (#"0abc" #"0abc"))
 ;;        (#"(?i:([\\da-f:]+)$)" #"abc" (#"abc" #"abc"))
 ;;        (#"(?i:([\\da-f:]+)$)" #"fed" (#"fed" #"fed"))
@@ -481,130 +486,131 @@
 ;;        (#"(?i:([\\da-f:]+)$)" #"gzzz" #f)
 ;;        (#"(?i:([\\da-f:]+)$)" #"fed\\x20" (#"20" #"20"))
 ;;        (#"(?i:([\\da-f:]+)$)" #"Any old rubbish" #f)
-;;        (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #".1.2.3" (#".1.2.3" #"1" #"2" #"3"))
-;;        (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #"A.12.123.0" (#"A.12.123.0" #"12" #"123" #"0"))
-;;        (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #".1.2.3333" #f)
-;;        (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #"1.2.3" #f)
-;;        (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #"1234.2.3" #f)
-;;        (#"^(\\d+)\\s+IN\\s+SOA\\s+(\\S+)\\s+(\\S+)\\s*\\(\\s*$" #"1 IN SOA non-sp1 non-sp2(" (#"1 IN SOA non-sp1 non-sp2(" #"1" #"non-sp1" #"non-sp2"))
-;;        (#"^(\\d+)\\s+IN\\s+SOA\\s+(\\S+)\\s+(\\S+)\\s*\\(\\s*$" #"1    IN    SOA    non-sp1    non-sp2   (" (#"1    IN    SOA    non-sp1    non-sp2   (" #"1" #"non-sp1" #"non-sp2"))
-;;        (#"^(\\d+)\\s+IN\\s+SOA\\s+(\\S+)\\s+(\\S+)\\s*\\(\\s*$" #"1IN SOA non-sp1 non-sp2(" #f)
-;;        (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"a." (#"a." #f))
-;;        (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"Z." (#"Z." #f))
-;;        (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"2." (#"2." #f))
-;;        (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"ab-c.pq-r." (#"ab-c.pq-r." #".pq-r"))
-;;        (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"sxk.zzz.ac.uk." (#"sxk.zzz.ac.uk." #".uk"))
-;;        (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"x-.y-." (#"x-.y-." #".y-"))
-;;        (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"-abc.peq." #f)
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.a" (#"*.a" #f #f #f))
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.b0-a" (#"*.b0-a" #"0-a" #f #f))
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.c3-b.c" (#"*.c3-b.c" #"3-b" #".c" #f))
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.c-a.b-c" (#"*.c-a.b-c" #"-a" #".b-c" #"-c"))
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.0" #f)
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.a-" #f)
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.a-b.c-" #f)
-;;        (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.c-a.0-c" #f)
-;;        (#"^(?=ab(de))(abd)(e)" #"abde" (#"abde" #"de" #"abd" #"e"))
-;;        (#"^(?!(ab)de|x)(abd)(f)" #"abdf" (#"abdf" #f #"abd" #"f"))
-;;        (#"^(?=(ab(cd)))(ab)" #"abcd" (#"ab" #"abcd" #"cd" #"ab"))
+       (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #".1.2.3" (#".1.2.3" #"1" #"2" #"3"))
+       (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #"A.12.123.0" (#"A.12.123.0" #"12" #"123" #"0"))
+       (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #".1.2.3333" #f)
+       (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #"1.2.3" #f)
+       (#"^.*\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$" #"1234.2.3" #f)
+       (#"^(\\d+)\\s+IN\\s+SOA\\s+(\\S+)\\s+(\\S+)\\s*\\(\\s*$" #"1 IN SOA non-sp1 non-sp2(" (#"1 IN SOA non-sp1 non-sp2(" #"1" #"non-sp1" #"non-sp2"))
+       (#"^(\\d+)\\s+IN\\s+SOA\\s+(\\S+)\\s+(\\S+)\\s*\\(\\s*$" #"1    IN    SOA    non-sp1    non-sp2   (" (#"1    IN    SOA    non-sp1    non-sp2   (" #"1" #"non-sp1" #"non-sp2"))
+       (#"^(\\d+)\\s+IN\\s+SOA\\s+(\\S+)\\s+(\\S+)\\s*\\(\\s*$" #"1IN SOA non-sp1 non-sp2(" #f)
+       (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"a." (#"a." #f))
+       (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"Z." (#"Z." #f))
+       (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"2." (#"2." #f))
+       (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"ab-c.pq-r." (#"ab-c.pq-r." #".pq-r"))
+       (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"sxk.zzz.ac.uk." (#"sxk.zzz.ac.uk." #".uk"))
+       (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"x-.y-." (#"x-.y-." #".y-"))
+       (#"^[a-zA-Z\\d][a-zA-Z\\d\\-]*(\\.[a-zA-Z\\d][a-zA-Z\\d\\-]*)*\\.$" #"-abc.peq." #f)
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.a" (#"*.a" #f #f #f))
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.b0-a" (#"*.b0-a" #"0-a" #f #f))
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.c3-b.c" (#"*.c3-b.c" #"3-b" #".c" #f))
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.c-a.b-c" (#"*.c-a.b-c" #"-a" #".b-c" #"-c"))
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.0" #f)
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.a-" #f)
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.a-b.c-" #f)
+       (#"^\\*\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?(\\.[a-z]([a-z\\-\\d]*[a-z\\d]+)?)*$" #"*.c-a.0-c" #f)
+       (#"^(?=ab(de))(abd)(e)" #"abde" (#"abde" #"de" #"abd" #"e"))
+       (#"^(?!(ab)de|x)(abd)(f)" #"abdf" (#"abdf" #f #"abd" #"f"))
+       (#"^(?=(ab(cd)))(ab)" #"abcd" (#"ab" #"abcd" #"cd" #"ab"))
+;; SyntaxError: Invalid regular expression: /(?i:^[\da-f](\.[\da-f])*$)/: Invalid group
 ;;        (#"(?i:^[\\da-f](\\.[\\da-f])*$)" #"a.b.c.d" (#"a.b.c.d" #".d"))
 ;;        (#"(?i:^[\\da-f](\\.[\\da-f])*$)" #"A.B.C.D" (#"A.B.C.D" #".D"))
 ;;        (#"(?i:^[\\da-f](\\.[\\da-f])*$)" #"a.b.c.1.2.3.C" (#"a.b.c.1.2.3.C" #".C"))
-;;        (#"^\\\".*\\\"\\s*(;.*)?$" #"\"1234\"" (#"\"1234\"" #f))
-;;        (#"^\\\".*\\\"\\s*(;.*)?$" #"\"abcd\" ;" (#"\"abcd\" ;" #";"))
-;;        (#"^\\\".*\\\"\\s*(;.*)?$" #"\"\" ; rhubarb" (#"\"\" ; rhubarb" #"; rhubarb"))
-;;        (#"^\\\".*\\\"\\s*(;.*)?$" #"\"1234\" : things" #f)
-;;        (#"^$" #"\\" #f)
-;;        (#"^(a(b(c)))(d(e(f)))(h(i(j)))(k(l(m)))$" #"abcdefhijklm" (#"abcdefhijklm" #"abc" #"bc" #"c" #"def" #"ef" #"f" #"hij" #"ij" #"j" #"klm" #"lm" #"m"))
-;;        (#"^(?:a(b(c)))(?:d(e(f)))(?:h(i(j)))(?:k(l(m)))$" #"abcdefhijklm" (#"abcdefhijklm" #"bc" #"c" #"ef" #"f" #"ij" #"j" #"lm" #"m"))
-;; ;       (#"^[\\w][\\W][\\s][\\S][\\d][\\D][\\b][\\n][\\c]][\\022]" #"a+ Z0+\\x08\\n\\x1d\\x12" #f)
-;;        (#"^[.^$|()*+?{,}]+" #".^\\$(*+)|{?,?}" (#".^"))
-;;        (#"^a*\\w" #"z" (#"z"))
-;;        (#"^a*\\w" #"az" (#"az"))
-;;        (#"^a*\\w" #"aaaz" (#"aaaz"))
-;;        (#"^a*\\w" #"a" (#"a"))
-;;        (#"^a*\\w" #"aa" (#"aa"))
-;;        (#"^a*\\w" #"aaaa" (#"aaaa"))
-;;        (#"^a*\\w" #"a+" (#"a"))
-;;        (#"^a*\\w" #"aa+" (#"aa"))
-;;        (#"^a*?\\w" #"z" (#"z"))
-;;        (#"^a*?\\w" #"az" (#"a"))
-;;        (#"^a*?\\w" #"aaaz" (#"a"))
-;;        (#"^a*?\\w" #"a" (#"a"))
-;;        (#"^a*?\\w" #"aa" (#"a"))
-;;        (#"^a*?\\w" #"aaaa" (#"a"))
-;;        (#"^a*?\\w" #"a+" (#"a"))
-;;        (#"^a*?\\w" #"aa+" (#"a"))
-;;        (#"^a+\\w" #"az" (#"az"))
-;;        (#"^a+\\w" #"aaaz" (#"aaaz"))
-;;        (#"^a+\\w" #"aa" (#"aa"))
-;;        (#"^a+\\w" #"aaaa" (#"aaaa"))
-;;        (#"^a+\\w" #"aa+" (#"aa"))
-;;        (#"^a+?\\w" #"az" (#"az"))
-;;        (#"^a+?\\w" #"aaaz" (#"aa"))
-;;        (#"^a+?\\w" #"aa" (#"aa"))
-;;        (#"^a+?\\w" #"aaaa" (#"aa"))
-;;        (#"^a+?\\w" #"aa+" (#"aa"))
-;;        (#"^\\d{8}\\w{2,}" #"1234567890" (#"1234567890"))
-;;        (#"^\\d{8}\\w{2,}" #"12345678ab" (#"12345678ab"))
-;;        (#"^\\d{8}\\w{2,}" #"12345678__" (#"12345678__"))
-;;        (#"^\\d{8}\\w{2,}" #"1234567" #f)
-;;        (#"^[aeiou\\d]{4,5}$" #"uoie" (#"uoie"))
-;;        (#"^[aeiou\\d]{4,5}$" #"1234" (#"1234"))
-;;        (#"^[aeiou\\d]{4,5}$" #"12345" (#"12345"))
-;;        (#"^[aeiou\\d]{4,5}$" #"aaaaa" (#"aaaaa"))
-;;        (#"^[aeiou\\d]{4,5}$" #"123456" #f)
-;;        (#"^[aeiou\\d]{4,5}?" #"uoie" (#"uoie"))
-;;        (#"^[aeiou\\d]{4,5}?" #"1234" (#"1234"))
-;;        (#"^[aeiou\\d]{4,5}?" #"12345" (#"1234"))
-;;        (#"^[aeiou\\d]{4,5}?" #"aaaaa" (#"aaaa"))
-;;        (#"^[aeiou\\d]{4,5}?" #"123456" (#"1234"))
-;;        (#"^(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\\11*(\\3\\4)\\12$" #"abcdefghijkcda2" #f)
-;;        (#"^(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\\11*(\\3\\4)\\12$" #"abcdefghijkkkkcda2" #f)
-;;        (#"(cat(a(ract|tonic)|erpillar)) \\1()2(3)" #"cataract cataract23" (#"cataract cataract23" #"cataract" #"aract" #"ract" #"" #"3"))
-;;        (#"(cat(a(ract|tonic)|erpillar)) \\1()2(3)" #"catatonic catatonic23" (#"catatonic catatonic23" #"catatonic" #"atonic" #"tonic" #"" #"3"))
-;;        (#"(cat(a(ract|tonic)|erpillar)) \\1()2(3)" #"caterpillar caterpillar23" (#"caterpillar caterpillar23" #"caterpillar" #"erpillar" #f #"" #"3"))
-;;        (#"^From +([^ ]+) +[a-zA-Z][a-zA-Z][a-zA-Z] +[a-zA-Z][a-zA-Z][a-zA-Z] +[0-9]?[0-9] +[0-9][0-9]:[0-9][0-9]" #"From abcd  Mon Sep 01 12:33:02 1997" (#"From abcd  Mon Sep 01 12:33" #"abcd"))
-;;        (#"^From\\s+\\S+\\s+([a-zA-Z]{3}\\s+){2}\\d{1,2}\\s+\\d\\d:\\d\\d" #"From abcd  Mon Sep 01 12:33:02 1997" (#"From abcd  Mon Sep 01 12:33" #"Sep "))
-;;        (#"^From\\s+\\S+\\s+([a-zA-Z]{3}\\s+){2}\\d{1,2}\\s+\\d\\d:\\d\\d" #"From abcd  Mon Sep  1 12:33:02 1997" (#"From abcd  Mon Sep  1 12:33" #"Sep  "))
-;;        (#"^From\\s+\\S+\\s+([a-zA-Z]{3}\\s+){2}\\d{1,2}\\s+\\d\\d:\\d\\d" #"From abcd  Sep 01 12:33:02 1997" #f)
-;;        (#"\\w+(?=\t)" #"the quick brown\\t fox" #f)
-;;        (#"foo(?!bar)(.*)" #"foobar is foolish see?" (#"foolish see?" #"lish see?"))
-;;        (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"foobar crowbar etc" (#"rowbar etc" #" etc"))
-;;        (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"barrel" (#"barrel" #"rel"))
-;;        (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"2barrel" (#"2barrel" #"rel"))
-;;        (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"A barrel" (#"A barrel" #"rel"))
-;;        (#"^(\\D*)(?=\\d)(?!123)" #"abc456" (#"abc" #"abc"))
-;;        (#"^(\\D*)(?=\\d)(?!123)" #"abc123" #f)
-;;        (#"^(a)\\1{2,3}(.)" #"aaab" (#"aaab" #"a" #"b"))
-;;        (#"^(a)\\1{2,3}(.)" #"aaaab" (#"aaaab" #"a" #"b"))
-;;        (#"^(a)\\1{2,3}(.)" #"aaaaab" (#"aaaaa" #"a" #"a"))
-;;        (#"^(a)\\1{2,3}(.)" #"aaaaaab" (#"aaaaa" #"a" #"a"))
-;;        (#"(?!^)abc" #"the abc" (#"abc"))
-;;        (#"(?!^)abc" #"abc" #f)
-;;        (#"(?=^)abc" #"abc" (#"abc"))
-;;        (#"(?=^)abc" #"the abc" #f)
-;;        (#"^[ab]{1,3}(ab*|b)" #"aabbbbb" (#"aabb" #"b"))
-;;        (#"^[ab]{1,3}?(ab*|b)" #"aabbbbb" (#"aabbbbb" #"abbbbb"))
-;;        (#"^[ab]{1,3}?(ab*?|b)" #"aabbbbb" (#"aa" #"a"))
-;;        (#"^[ab]{1,3}(ab*?|b)" #"aabbbbb" (#"aabb" #"b"))
-;; #|
-;;        (#"abc\\0def\\00pqr\\000xyz\\0000AB" #"abc\\0def\\00pqr\\000xyz\\0000AB" #f)
-;;        (#"abc\\0def\\00pqr\\000xyz\\0000AB" #"abc456 abc\\0def\\00pqr\\000xyz\\0000ABCDE" #f)
-;;        (#"abc\\x0def\\x00pqr\\x000xyz\\x0000AB" #"abc\\x0def\\x00pqr\\x000xyz\\x0000AB" #f)
-;;        (#"abc\\x0def\\x00pqr\\x000xyz\\x0000AB" #"abc456 abc\\x0def\\x00pqr\\x000xyz\\x0000ABCDE" #f)
-;;        (#"^[\\000-\\037]" #"\\0A" #f)
-;;        (#"^[\\000-\\037]" #"\\01B" #f)
-;;        (#"^[\\000-\\037]" #"\\037C" #f)
-;;        (#"\\0*" #"\\0\\0\\0\\0" #f)
-;;        (#"A\\x0{2,3}Z" #"The A\\x0\\x0Z" #f)
-;;        (#"A\\x0{2,3}Z" #"An A\\0\\x0\\0Z" #f)
-;;        (#"A\\x0{2,3}Z" #"A\\0Z" #f)
-;;        (#"A\\x0{2,3}Z" #"A\\0\\x0\\0\\x0Z" #f)
-;; |#
-;;        (#"^(cow|)\\1(bell)" #"cowcowbell" (#"cowcowbell" #"cow" #"bell"))
-;;        (#"^(cow|)\\1(bell)" #"bell" (#"bell" #"" #"bell"))
-;;        (#"^(cow|)\\1(bell)" #"cowbell" #f)
+       (#"^\\\".*\\\"\\s*(;.*)?$" #"\"1234\"" (#"\"1234\"" #f))
+       (#"^\\\".*\\\"\\s*(;.*)?$" #"\"abcd\" ;" (#"\"abcd\" ;" #";"))
+       (#"^\\\".*\\\"\\s*(;.*)?$" #"\"\" ; rhubarb" (#"\"\" ; rhubarb" #"; rhubarb"))
+       (#"^\\\".*\\\"\\s*(;.*)?$" #"\"1234\" : things" #f)
+       (#"^$" #"\\" #f)
+       (#"^(a(b(c)))(d(e(f)))(h(i(j)))(k(l(m)))$" #"abcdefhijklm" (#"abcdefhijklm" #"abc" #"bc" #"c" #"def" #"ef" #"f" #"hij" #"ij" #"j" #"klm" #"lm" #"m"))
+       (#"^(?:a(b(c)))(?:d(e(f)))(?:h(i(j)))(?:k(l(m)))$" #"abcdefhijklm" (#"abcdefhijklm" #"bc" #"c" #"ef" #"f" #"ij" #"j" #"lm" #"m"))
+;       (#"^[\\w][\\W][\\s][\\S][\\d][\\D][\\b][\\n][\\c]][\\022]" #"a+ Z0+\\x08\\n\\x1d\\x12" #f)
+       (#"^[.^$|()*+?{,}]+" #".^\\$(*+)|{?,?}" (#".^"))
+       (#"^a*\\w" #"z" (#"z"))
+       (#"^a*\\w" #"az" (#"az"))
+       (#"^a*\\w" #"aaaz" (#"aaaz"))
+       (#"^a*\\w" #"a" (#"a"))
+       (#"^a*\\w" #"aa" (#"aa"))
+       (#"^a*\\w" #"aaaa" (#"aaaa"))
+       (#"^a*\\w" #"a+" (#"a"))
+       (#"^a*\\w" #"aa+" (#"aa"))
+       (#"^a*?\\w" #"z" (#"z"))
+       (#"^a*?\\w" #"az" (#"a"))
+       (#"^a*?\\w" #"aaaz" (#"a"))
+       (#"^a*?\\w" #"a" (#"a"))
+       (#"^a*?\\w" #"aa" (#"a"))
+       (#"^a*?\\w" #"aaaa" (#"a"))
+       (#"^a*?\\w" #"a+" (#"a"))
+       (#"^a*?\\w" #"aa+" (#"a"))
+       (#"^a+\\w" #"az" (#"az"))
+       (#"^a+\\w" #"aaaz" (#"aaaz"))
+       (#"^a+\\w" #"aa" (#"aa"))
+       (#"^a+\\w" #"aaaa" (#"aaaa"))
+       (#"^a+\\w" #"aa+" (#"aa"))
+       (#"^a+?\\w" #"az" (#"az"))
+       (#"^a+?\\w" #"aaaz" (#"aa"))
+       (#"^a+?\\w" #"aa" (#"aa"))
+       (#"^a+?\\w" #"aaaa" (#"aa"))
+       (#"^a+?\\w" #"aa+" (#"aa"))
+       (#"^\\d{8}\\w{2,}" #"1234567890" (#"1234567890"))
+       (#"^\\d{8}\\w{2,}" #"12345678ab" (#"12345678ab"))
+       (#"^\\d{8}\\w{2,}" #"12345678__" (#"12345678__"))
+       (#"^\\d{8}\\w{2,}" #"1234567" #f)
+       (#"^[aeiou\\d]{4,5}$" #"uoie" (#"uoie"))
+       (#"^[aeiou\\d]{4,5}$" #"1234" (#"1234"))
+       (#"^[aeiou\\d]{4,5}$" #"12345" (#"12345"))
+       (#"^[aeiou\\d]{4,5}$" #"aaaaa" (#"aaaaa"))
+       (#"^[aeiou\\d]{4,5}$" #"123456" #f)
+       (#"^[aeiou\\d]{4,5}?" #"uoie" (#"uoie"))
+       (#"^[aeiou\\d]{4,5}?" #"1234" (#"1234"))
+       (#"^[aeiou\\d]{4,5}?" #"12345" (#"1234"))
+       (#"^[aeiou\\d]{4,5}?" #"aaaaa" (#"aaaa"))
+       (#"^[aeiou\\d]{4,5}?" #"123456" (#"1234"))
+       (#"^(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\\11*(\\3\\4)\\12$" #"abcdefghijkcda2" #f)
+       (#"^(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\\11*(\\3\\4)\\12$" #"abcdefghijkkkkcda2" #f)
+       (#"(cat(a(ract|tonic)|erpillar)) \\1()2(3)" #"cataract cataract23" (#"cataract cataract23" #"cataract" #"aract" #"ract" #"" #"3"))
+       (#"(cat(a(ract|tonic)|erpillar)) \\1()2(3)" #"catatonic catatonic23" (#"catatonic catatonic23" #"catatonic" #"atonic" #"tonic" #"" #"3"))
+       (#"(cat(a(ract|tonic)|erpillar)) \\1()2(3)" #"caterpillar caterpillar23" (#"caterpillar caterpillar23" #"caterpillar" #"erpillar" #f #"" #"3"))
+       (#"^From +([^ ]+) +[a-zA-Z][a-zA-Z][a-zA-Z] +[a-zA-Z][a-zA-Z][a-zA-Z] +[0-9]?[0-9] +[0-9][0-9]:[0-9][0-9]" #"From abcd  Mon Sep 01 12:33:02 1997" (#"From abcd  Mon Sep 01 12:33" #"abcd"))
+       (#"^From\\s+\\S+\\s+([a-zA-Z]{3}\\s+){2}\\d{1,2}\\s+\\d\\d:\\d\\d" #"From abcd  Mon Sep 01 12:33:02 1997" (#"From abcd  Mon Sep 01 12:33" #"Sep "))
+       (#"^From\\s+\\S+\\s+([a-zA-Z]{3}\\s+){2}\\d{1,2}\\s+\\d\\d:\\d\\d" #"From abcd  Mon Sep  1 12:33:02 1997" (#"From abcd  Mon Sep  1 12:33" #"Sep  "))
+       (#"^From\\s+\\S+\\s+([a-zA-Z]{3}\\s+){2}\\d{1,2}\\s+\\d\\d:\\d\\d" #"From abcd  Sep 01 12:33:02 1997" #f)
+       (#"\\w+(?=\t)" #"the quick brown\\t fox" #f)
+       (#"foo(?!bar)(.*)" #"foobar is foolish see?" (#"foolish see?" #"lish see?"))
+       (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"foobar crowbar etc" (#"rowbar etc" #" etc"))
+       (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"barrel" (#"barrel" #"rel"))
+       (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"2barrel" (#"2barrel" #"rel"))
+       (#"(?:(?!foo)...|^.{0,2})bar(.*)" #"A barrel" (#"A barrel" #"rel"))
+       (#"^(\\D*)(?=\\d)(?!123)" #"abc456" (#"abc" #"abc"))
+       (#"^(\\D*)(?=\\d)(?!123)" #"abc123" #f)
+       (#"^(a)\\1{2,3}(.)" #"aaab" (#"aaab" #"a" #"b"))
+       (#"^(a)\\1{2,3}(.)" #"aaaab" (#"aaaab" #"a" #"b"))
+       (#"^(a)\\1{2,3}(.)" #"aaaaab" (#"aaaaa" #"a" #"a"))
+       (#"^(a)\\1{2,3}(.)" #"aaaaaab" (#"aaaaa" #"a" #"a"))
+       (#"(?!^)abc" #"the abc" (#"abc"))
+       (#"(?!^)abc" #"abc" #f)
+       (#"(?=^)abc" #"abc" (#"abc"))
+       (#"(?=^)abc" #"the abc" #f)
+       (#"^[ab]{1,3}(ab*|b)" #"aabbbbb" (#"aabb" #"b"))
+       (#"^[ab]{1,3}?(ab*|b)" #"aabbbbb" (#"aabbbbb" #"abbbbb"))
+       (#"^[ab]{1,3}?(ab*?|b)" #"aabbbbb" (#"aa" #"a"))
+       (#"^[ab]{1,3}(ab*?|b)" #"aabbbbb" (#"aabb" #"b"))
+#|
+       (#"abc\\0def\\00pqr\\000xyz\\0000AB" #"abc\\0def\\00pqr\\000xyz\\0000AB" #f)
+       (#"abc\\0def\\00pqr\\000xyz\\0000AB" #"abc456 abc\\0def\\00pqr\\000xyz\\0000ABCDE" #f)
+       (#"abc\\x0def\\x00pqr\\x000xyz\\x0000AB" #"abc\\x0def\\x00pqr\\x000xyz\\x0000AB" #f)
+       (#"abc\\x0def\\x00pqr\\x000xyz\\x0000AB" #"abc456 abc\\x0def\\x00pqr\\x000xyz\\x0000ABCDE" #f)
+       (#"^[\\000-\\037]" #"\\0A" #f)
+       (#"^[\\000-\\037]" #"\\01B" #f)
+       (#"^[\\000-\\037]" #"\\037C" #f)
+       (#"\\0*" #"\\0\\0\\0\\0" #f)
+       (#"A\\x0{2,3}Z" #"The A\\x0\\x0Z" #f)
+       (#"A\\x0{2,3}Z" #"An A\\0\\x0\\0Z" #f)
+       (#"A\\x0{2,3}Z" #"A\\0Z" #f)
+       (#"A\\x0{2,3}Z" #"A\\0\\x0\\0\\x0Z" #f)
+|#
+       (#"^(cow|)\\1(bell)" #"cowcowbell" (#"cowcowbell" #"cow" #"bell"))
+       (#"^(cow|)\\1(bell)" #"bell" (#"bell" #"" #"bell"))
+       (#"^(cow|)\\1(bell)" #"cowbell" #f)
 ;; #|
 ;;        (#"^\\s" #"\\040abc" #f)
 ;;        (#"^\\s" #"\\x0cabc" #f)
@@ -613,242 +619,244 @@
 ;;        (#"^\\s" #"\\tabc" #f)
 ;;        (#"^\\s" #"abc" #f)
 ;; |#
-;;        (#"^(a|x)\\1*b" #"ab" (#"ab" #"a"))
-;;        (#"^(a|x)\\1*b" #"aaaab" (#"aaaab" #"a"))
-;;        (#"^(a|x)\\1*b" #"acb" #f)
-;;        (#"^(a|x)\\1+b" #"aab" (#"aab" #"a"))
-;;        (#"^(a|x)\\1+b" #"aaaab" (#"aaaab" #"a"))
-;;        (#"^(a|x)\\1+b" #"ab" #f)
-;;        (#"^(a|)\\1?b" #"ab" (#"ab" #"a"))
-;;        (#"^(a|)\\1?b" #"aab" (#"aab" #"a"))
-;;        (#"^(a|)\\1?b" #"b" (#"b" #""))
-;;        (#"^(a|)\\1?b" #"acb" #f)
+       (#"^(a|x)\\1*b" #"ab" (#"ab" #"a"))
+       (#"^(a|x)\\1*b" #"aaaab" (#"aaaab" #"a"))
+       (#"^(a|x)\\1*b" #"acb" #f)
+       (#"^(a|x)\\1+b" #"aab" (#"aab" #"a"))
+       (#"^(a|x)\\1+b" #"aaaab" (#"aaaab" #"a"))
+       (#"^(a|x)\\1+b" #"ab" #f)
+       (#"^(a|)\\1?b" #"ab" (#"ab" #"a"))
+       (#"^(a|)\\1?b" #"aab" (#"aab" #"a"))
+       (#"^(a|)\\1?b" #"b" (#"b" #""))
+       (#"^(a|)\\1?b" #"acb" #f)
 ;;        #"^(a|)\\1{2}b"
 ;;        #"^(a|)\\1{2,3}b"
-;;        (#"ab{1,3}bc" #"abbbbc" (#"abbbbc"))
-;;        (#"ab{1,3}bc" #"abbbc" (#"abbbc"))
-;;        (#"ab{1,3}bc" #"abbc" (#"abbc"))
-;;        (#"ab{1,3}bc" #"abc" #f)
-;;        (#"ab{1,3}bc" #"abbbbbc" #f)
-;;        (#"([^.]*)\\.([^:]*):[T ]+(.*)" #"track1.title:TBlah blah blah" (#"track1.title:TBlah blah blah" #"track1" #"title" #"Blah blah blah"))
+       (#"ab{1,3}bc" #"abbbbc" (#"abbbbc"))
+       (#"ab{1,3}bc" #"abbbc" (#"abbbc"))
+       (#"ab{1,3}bc" #"abbc" (#"abbc"))
+       (#"ab{1,3}bc" #"abc" #f)
+       (#"ab{1,3}bc" #"abbbbbc" #f)
+       (#"([^.]*)\\.([^:]*):[T ]+(.*)" #"track1.title:TBlah blah blah" (#"track1.title:TBlah blah blah" #"track1" #"title" #"Blah blah blah"))
+;; SyntaxError: Invalid regular expression: /(?i:([^.]*)\.([^:]*):[T ]+(.*))/: Invalid group
 ;;        (#"(?i:([^.]*)\\.([^:]*):[T ]+(.*))" #"track1.title:TBlah blah blah" (#"track1.title:TBlah blah blah" #"track1" #"title" #"Blah blah blah"))
 ;;        (#"(?i:([^.]*)\\.([^:]*):[t ]+(.*))" #"track1.title:TBlah blah blah" (#"track1.title:TBlah blah blah" #"track1" #"title" #"Blah blah blah"))
-;;        (#"^[W-c]+$" #"WXY_^abc" (#"WXY_^abc"))
-;;        (#"^[W-c]+$" #"wxy" #f)
-;;        (#"(?i:^[W-c]+$)" #"WXY_^abc" (#"WXY_^abc"))
-;;        (#"(?i:^[W-c]+$)" #"wxy_^ABC" (#"wxy_^ABC"))
-;;        (#"(?i:^[\x3f-\x5F]+$)" #"WXY_^abc" (#"WXY_^abc"))
-;;        (#"(?i:^[\x3f-\x5F]+$)" #"wxy_^ABC" (#"wxy_^ABC"))
-;;        (#"(?:b)|(?::+)" #"b::c" (#"b"))
-;;        (#"(?:b)|(?::+)" #"c::b" (#"::"))
-;;        (#"[-az]+" #"az-" (#"az-"))
-;;        (#"[-az]+" #"b" #f)
-;;        (#"[az-]+" #"za-" (#"za-"))
-;;        (#"[az-]+" #"b" #f)
-;;        (#"[a\\-z]+" #"a-z" (#"a-z"))
-;;        (#"[a\\-z]+" #"b" #f)
-;;        (#"[a-z]+" #"abcdxyz" (#"abcdxyz"))
-;;        (#"[\\d-]+" #"12-34" (#"12-34"))
-;;        (#"[\\d-]+" #"aaa" #f)
+       (#"^[W-c]+$" #"WXY_^abc" (#"WXY_^abc"))
+       (#"^[W-c]+$" #"wxy" #f)
+       ;; (#"(?i:^[W-c]+$)" #"WXY_^abc" (#"WXY_^abc"))
+       ;; (#"(?i:^[W-c]+$)" #"wxy_^ABC" (#"wxy_^ABC"))
+       ;; (#"(?i:^[\x3f-\x5F]+$)" #"WXY_^abc" (#"WXY_^abc"))
+       ;; (#"(?i:^[\x3f-\x5F]+$)" #"wxy_^ABC" (#"wxy_^ABC"))
+       (#"(?:b)|(?::+)" #"b::c" (#"b"))
+       (#"(?:b)|(?::+)" #"c::b" (#"::"))
+       (#"[-az]+" #"az-" (#"az-"))
+       (#"[-az]+" #"b" #f)
+       (#"[az-]+" #"za-" (#"za-"))
+       (#"[az-]+" #"b" #f)
+       (#"[a\\-z]+" #"a-z" (#"a-z"))
+       (#"[a\\-z]+" #"b" #f)
+       (#"[a-z]+" #"abcdxyz" (#"abcdxyz"))
+       (#"[\\d-]+" #"12-34" (#"12-34"))
+       (#"[\\d-]+" #"aaa" #f)
 ;;        #"[\\d-z]"
-;;        (#"[\\dz-]+" #"12-34z" (#"12-34z"))
-;;        (#"[\\dz-]+" #"aaa" #f)
-;;        (#"\\\x5c" #"\\\\" (#"\\"))
-;;        (#"\x20Z" #"the Zoo" (#" Z"))
-;;        (#"\x20Z" #"Zulu" #f)
+       (#"[\\dz-]+" #"12-34z" (#"12-34z"))
+       (#"[\\dz-]+" #"aaa" #f)
+       (#"\\\x5c" #"\\\\" (#"\\"))
+       (#"\x20Z" #"the Zoo" (#" Z"))
+       (#"\x20Z" #"Zulu" #f)
 ;;        (#"(?i:(abc)\\1)" #"abcabc" (#"abcabc" #"abc"))
 ;;        (#"(?i:(abc)\\1)" #"ABCabc" (#"ABCabc" #"ABC"))
 ;;        (#"(?i:(abc)\\1)" #"abcABC" (#"abcABC" #"abc"))
-;;        (#"ab\\{3cd" #"ab{3cd" (#"ab{3cd"))
+        (#"ab\\{3cd" #"ab{3cd" (#"ab{3cd"))
 ;;        #"ab{3cd"
-;;        (#"ab\\{3,cd" #"ab{3,cd" (#"ab{3,cd"))
+        (#"ab\\{3,cd" #"ab{3,cd" (#"ab{3,cd"))
 ;;        #"ab{3,cd"
-;;        (#"ab\\{3,4a\\}cd" #"ab{3,4a}cd" (#"ab{3,4a}cd"))
+        (#"ab\\{3,4a\\}cd" #"ab{3,4a}cd" (#"ab{3,4a}cd"))
 ;;        #"ab{3,4a}cd"
-;;        (#"\\{4,5a\\}bc" #"{4,5a}bc" (#"{4,5a}bc"))
+        (#"\\{4,5a\\}bc" #"{4,5a}bc" (#"{4,5a}bc"))
 ;;        #"{4,5a}bc"
-;;        (#"(abc)\123" #"abc\x53" (#"abcS" #"abc"))
+        (#"(abc)\123" #"abc\x53" (#"abcS" #"abc"))
 ;;        (#"(abc)\223" #"abc\x93" (#"abc\x93" #"abc"))
 ;;        (#"(abc)\323" #"abc\xd3" (#"abc\xd3" #"abc"))
-;;        (#"(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)\\12\123" #"abcdefghijkllS" (#"abcdefghijkllS" #"a" #"b" #"c" #"d" #"e" #"f" #"g" #"h" #"i" #"j" #"k" #"l"))
+        (#"(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)\\12\123" #"abcdefghijkllS" (#"abcdefghijkllS" #"a" #"b" #"c" #"d" #"e" #"f" #"g" #"h" #"i" #"j" #"k" #"l"))
 ;;        #"(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\\12\123"
-;;        (#"a{0}bc" #"bc" (#"bc"))
-;;        (#"(a|(bc)){0,0}?xyz" #"xyz" (#"xyz" #f #f))
+        (#"a{0}bc" #"bc" (#"bc"))
+        (#"(a|(bc)){0,0}?xyz" #"xyz" (#"xyz" #f #f))
 ;;        (#"abc[\\10]de" #"abc\010de" #f)
 ;;        (#"abc[\\1]de" #"abc\1de" #f)
 ;;        (#"(abc)[\\1]de" #"abc\1de" #f)
 ;;        "^([^a])([^\\b])([^c]*)([^d]{3,4})"
-;;        (#"[^a]" #"Abc" (#"A"))
+        (#"[^a]" #"Abc" (#"A"))
 ;;        (#"(?i:[^a])" #"Abc " (#"b"))
-;;        (#"[^a]+" #"AAAaAbc" (#"AAA"))
+        (#"[^a]+" #"AAAaAbc" (#"AAA"))
 ;;        (#"(?i:[^a]+)" #"AAAaAbc " (#"bc "))
-;;        (#"[^k]$" #"abc" (#"c"))
-;;        (#"[^k]$" #"abk   " (#" "))
-;;        (#"[^k]{2,3}$" #"abc" (#"abc"))
-;;        (#"[^k]{2,3}$" #"kbc" (#"bc"))
-;;        (#"[^k]{2,3}$" #"kabc " (#"bc "))
-;;        (#"[^k]{2,3}$" #"abk" #f)
-;;        (#"[^k]{2,3}$" #"akb" #f)
-;;        (#"[^k]{2,3}$" #"akk " #f)
-;;        (#"^\\d{8,}\\@.+[^k]$" #"12345678\\@a.b.c.d" #f)
-;;        (#"^\\d{8,}\\@.+[^k]$" #"123456789\\@x.y.z" #f)
-;;        (#"^\\d{8,}\\@.+[^k]$" #"12345678\\@x.y.uk" #f)
-;;        (#"^\\d{8,}\\@.+[^k]$" #"1234567\\@a.b.c.d       " #f)
-;;        (#"(a)\\1{8,}" #"aaaaaaaaa" (#"aaaaaaaaa" #"a"))
-;;        (#"(a)\\1{8,}" #"aaaaaaaaaa" (#"aaaaaaaaaa" #"a"))
-;;        (#"(a)\\1{8,}" #"aaaaaaa   " #f)
-;;        (#"[^a]" #"aaaabcd" (#"b"))
-;;        (#"[^a]" #"aaAabcd " (#"A"))
+       (#"[^k]$" #"abc" (#"c"))
+       (#"[^k]$" #"abk   " (#" "))
+       (#"[^k]{2,3}$" #"abc" (#"abc"))
+       (#"[^k]{2,3}$" #"kbc" (#"bc"))
+       (#"[^k]{2,3}$" #"kabc " (#"bc "))
+       (#"[^k]{2,3}$" #"abk" #f)
+       (#"[^k]{2,3}$" #"akb" #f)
+       (#"[^k]{2,3}$" #"akk " #f)
+       (#"^\\d{8,}\\@.+[^k]$" #"12345678\\@a.b.c.d" #f)
+       (#"^\\d{8,}\\@.+[^k]$" #"123456789\\@x.y.z" #f)
+       (#"^\\d{8,}\\@.+[^k]$" #"12345678\\@x.y.uk" #f)
+       (#"^\\d{8,}\\@.+[^k]$" #"1234567\\@a.b.c.d       " #f)
+       (#"(a)\\1{8,}" #"aaaaaaaaa" (#"aaaaaaaaa" #"a"))
+       (#"(a)\\1{8,}" #"aaaaaaaaaa" (#"aaaaaaaaaa" #"a"))
+       (#"(a)\\1{8,}" #"aaaaaaa   " #f)
+       (#"[^a]" #"aaaabcd" (#"b"))
+       (#"[^a]" #"aaAabcd " (#"A"))
 ;;        (#"(?i:[^a])" #"aaaabcd" (#"b"))
 ;;        (#"(?i:[^a])" #"aaAabcd " (#"b"))
-;;        (#"[^az]" #"aaaabcd" (#"b"))
-;;        (#"[^az]" #"aaAabcd " (#"A"))
+       (#"[^az]" #"aaaabcd" (#"b"))
+       (#"[^az]" #"aaAabcd " (#"A"))
 ;;        (#"(?i:[^az])" #"aaaabcd" (#"b"))
 ;;        (#"(?i:[^az])" #"aaAabcd " (#"b"))
-;;        (#"P[^*]TAIRE[^*]{1,6}?LL" #"xxxxxxxxxxxPSTAIREISLLxxxxxxxxx" (#"PSTAIREISLL"))
-;;        (#"P[^*]TAIRE[^*]{1,}?LL" #"xxxxxxxxxxxPSTAIREISLLxxxxxxxxx" (#"PSTAIREISLL"))
-;;        (#"(\\.\\d\\d[1-9]?)\\d+" #"1.230003938" (#".230003938" #".23"))
-;;        (#"(\\.\\d\\d[1-9]?)\\d+" #"1.875000282   " (#".875000282" #".875"))
-;;        (#"(\\.\\d\\d[1-9]?)\\d+" #"1.235  " (#".235" #".23"))
-;;        (#"(\\.\\d\\d((?=0)|\\d(?=\\d)))" #"1.230003938      " (#".23" #".23" #""))
-;;        (#"(\\.\\d\\d((?=0)|\\d(?=\\d)))" #"1.875000282" (#".875" #".875" #"5"))
-;;        (#"(\\.\\d\\d((?=0)|\\d(?=\\d)))" #"1.235 " #f)
-;;        (#"a(?:)b" #"ab " (#"ab"))
+       (#"P[^*]TAIRE[^*]{1,6}?LL" #"xxxxxxxxxxxPSTAIREISLLxxxxxxxxx" (#"PSTAIREISLL"))
+       (#"P[^*]TAIRE[^*]{1,}?LL" #"xxxxxxxxxxxPSTAIREISLLxxxxxxxxx" (#"PSTAIREISLL"))
+       (#"(\\.\\d\\d[1-9]?)\\d+" #"1.230003938" (#".230003938" #".23"))
+       (#"(\\.\\d\\d[1-9]?)\\d+" #"1.875000282   " (#".875000282" #".875"))
+       (#"(\\.\\d\\d[1-9]?)\\d+" #"1.235  " (#".235" #".23"))
+       (#"(\\.\\d\\d((?=0)|\\d(?=\\d)))" #"1.230003938      " (#".23" #".23" #""))
+       (#"(\\.\\d\\d((?=0)|\\d(?=\\d)))" #"1.875000282" (#".875" #".875" #"5"))
+       (#"(\\.\\d\\d((?=0)|\\d(?=\\d)))" #"1.235 " #f)
+       (#"a(?:)b" #"ab " (#"ab"))
 ;;        (#"(?i:\\b(foo)\\s+(\\w+))" #"Food is on the foo table" (#"foo table" #"foo" #"table"))
-;;        (#"foo(.*)bar" #"The food is under the bar in the barn." (#"food is under the bar in the bar" #"d is under the bar in the "))
-;;        (#"foo(.*?)bar" #"The food is under the bar in the barn." (#"food is under the bar" #"d is under the "))
-;;        (#"(.*)(\\d*)" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: 53147" #""))
-;;        (#"(.*)(\\d+)" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: 5314" #"7"))
-;;        (#"(.*?)(\\d*)" #"I have 2 numbers: 53147" (#"" #"" #""))
-;;        (#"(.*?)(\\d+)" #"I have 2 numbers: 53147" (#"I have 2" #"I have " #"2"))
-;;        (#"(.*)(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: 5314" #"7"))
-;;        (#"(.*?)(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: " #"53147"))
-;;        (#"(.*)\\b(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: " #"53147"))
-;;        (#"(.*\\D)(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: " #"53147"))
-;;        (#"^\\D*(?!123)" #"ABC123" (#"AB"))
-;;        (#"^(\\D*)(?=\\d)(?!123)" #"ABC445" (#"ABC" #"ABC"))
-;;        (#"^(\\D*)(?=\\d)(?!123)" #"ABC123" #f)
+       (#"foo(.*)bar" #"The food is under the bar in the barn." (#"food is under the bar in the bar" #"d is under the bar in the "))
+       (#"foo(.*?)bar" #"The food is under the bar in the barn." (#"food is under the bar" #"d is under the "))
+       (#"(.*)(\\d*)" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: 53147" #""))
+       (#"(.*)(\\d+)" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: 5314" #"7"))
+       (#"(.*?)(\\d*)" #"I have 2 numbers: 53147" (#"" #"" #""))
+       (#"(.*?)(\\d+)" #"I have 2 numbers: 53147" (#"I have 2" #"I have " #"2"))
+       (#"(.*)(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: 5314" #"7"))
+       (#"(.*?)(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: " #"53147"))
+       (#"(.*)\\b(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: " #"53147"))
+       (#"(.*\\D)(\\d+)$" #"I have 2 numbers: 53147" (#"I have 2 numbers: 53147" #"I have 2 numbers: " #"53147"))
+       (#"^\\D*(?!123)" #"ABC123" (#"AB"))
+       (#"^(\\D*)(?=\\d)(?!123)" #"ABC445" (#"ABC" #"ABC"))
+       (#"^(\\D*)(?=\\d)(?!123)" #"ABC123" #f)
 ;;        #"^[W-]46]"
-;;        (#"^[W-]46\\]" #"W46]789 " (#"W46]"))
-;;        (#"^[W-]46\\]" #"-46]789" (#"-46]"))
-;;        (#"^[W-]46\\]" #"Wall" #f)
-;;        (#"^[W-]46\\]" #"Zebra" #f)
-;;        (#"^[W-]46\\]" #"42" #f)
-;;        (#"^[W-]46\\]" #"[abcd] " #f)
-;;        (#"^[W-]46\\]" #"]abcd[" #f)
-;;        (#"^[W-\\]46]" #"W46]789 " (#"W"))
-;;        (#"^[W-\\]46]" #"Wall" (#"W"))
-;;        (#"^[W-\\]46]" #"Zebra" (#"Z"))
-;;        (#"^[W-\\]46]" #"Xylophone  " (#"X"))
-;;        (#"^[W-\\]46]" #"42" (#"4"))
-;;        (#"^[W-\\]46]" #"[abcd] " (#"["))
-;;        (#"^[W-\\]46]" #"]abcd[" (#"]"))
-;;        (#"^[W-\\]46]" #"\\\\backslash " (#"\\"))
-;;        (#"^[W-\\]46]" #"-46]789" #f)
-;;        (#"^[W-\\]46]" #"well" #f)
-;;        (#"\\d\\d\\/\\d\\d\\/\\d\\d\\d\\d" #"01/01/2000" (#"01/01/2000"))
-;;        (#"word (?:[a-zA-Z0-9]+ ){0,10}otherword" #"rd cat dog elephant mussel cow horse canary baboon snake shark otherword" #f)
-;;        (#"word (?:[a-zA-Z0-9]+ ){0,10}otherword" #"rd cat dog elephant mussel cow horse canary baboon snake shark" #f)
-;;        (#"word (?:[a-zA-Z0-9]+ ){0,300}otherword" #"rd cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope" #f)
-;;        (#"^(a){0,0}" #"bcd" (#"" #f))
-;;        (#"^(a){0,0}" #"abc" (#"" #f))
-;;        (#"^(a){0,0}" #"aab     " (#"" #f))
-;;        (#"^(a){0,1}" #"bcd" (#"" #f))
-;;        (#"^(a){0,1}" #"abc" (#"a" #"a"))
-;;        (#"^(a){0,1}" #"aab  " (#"a" #"a"))
-;;        (#"^(a){0,2}" #"bcd" (#"" #f))
-;;        (#"^(a){0,2}" #"abc" (#"a" #"a"))
-;;        (#"^(a){0,2}" #"aab  " (#"aa" #"a"))
-;;        (#"^(a){0,3}" #"bcd" (#"" #f))
-;;        (#"^(a){0,3}" #"abc" (#"a" #"a"))
-;;        (#"^(a){0,3}" #"aab" (#"aa" #"a"))
-;;        (#"^(a){0,3}" #"aaa   " (#"aaa" #"a"))
-;;        (#"^(a){0,}" #"bcd" (#"" #f))
-;;        (#"^(a){0,}" #"abc" (#"a" #"a"))
-;;        (#"^(a){0,}" #"aab" (#"aa" #"a"))
-;;        (#"^(a){0,}" #"aaa" (#"aaa" #"a"))
-;;        (#"^(a){0,}" #"aaaaaaaa    " (#"aaaaaaaa" #"a"))
-;;        (#"^(a){1,1}" #"bcd" #f)
-;;        (#"^(a){1,1}" #"abc" (#"a" #"a"))
-;;        (#"^(a){1,1}" #"aab  " (#"a" #"a"))
-;;        (#"^(a){1,2}" #"bcd" #f)
-;;        (#"^(a){1,2}" #"abc" (#"a" #"a"))
-;;        (#"^(a){1,2}" #"aab  " (#"aa" #"a"))
-;;        (#"^(a){1,3}" #"bcd" #f)
-;;        (#"^(a){1,3}" #"abc" (#"a" #"a"))
-;;        (#"^(a){1,3}" #"aab" (#"aa" #"a"))
-;;        (#"^(a){1,3}" #"aaa   " (#"aaa" #"a"))
-;;        (#"^(a){1,}" #"bcd" #f)
-;;        (#"^(a){1,}" #"abc" (#"a" #"a"))
-;;        (#"^(a){1,}" #"aab" (#"aa" #"a"))
-;;        (#"^(a){1,}" #"aaa" (#"aaa" #"a"))
-;;        (#"^(a){1,}" #"aaaaaaaa    " (#"aaaaaaaa" #"a"))
-;;        (#"^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]" #"123456654321" (#"123456654321"))
-;;        (#"^\\d\\d\\d\\d\\d\\d\\d\\d\\d\\d\\d\\d" #"123456654321 " (#"123456654321"))
-;;        (#"^[\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d]" #"123456654321" (#"123456654321"))
-;;        (#"^[abc]{12}" #"abcabcabcabc" (#"abcabcabcabc"))
-;;        (#"^[a-c]{12}" #"abcabcabcabc" (#"abcabcabcabc"))
-;;        (#"^(a|b|c){12}" #"abcabcabcabc " (#"abcabcabcabc" #"c"))
-;;        (#"^[abcdefghijklmnopqrstuvwxy0123456789]" #"n" (#"n"))
-;;        (#"^[abcdefghijklmnopqrstuvwxy0123456789]" #"z " #f)
-;;        (#"abcde{0,0}" #"abcd" (#"abcd"))
-;;        (#"abcde{0,0}" #"abce  " #f)
-;;        (#"ab[cd]{0,0}e" #"abe" (#"abe"))
-;;        (#"ab[cd]{0,0}e" #"abcde " #f)
-;;        (#"ab(c){0,0}d" #"abd" (#"abd" #f))
-;;        (#"ab(c){0,0}d" #"abcd   " #f)
-;;        (#"a(b*)" #"a" (#"a" #""))
-;;        (#"a(b*)" #"ab" (#"ab" #"b"))
-;;        (#"a(b*)" #"abbbb" (#"abbbb" #"bbbb"))
-;;        (#"a(b*)" #"bbbbb    " #f)
-;;        (#"ab\\d{0}e" #"abe" (#"abe"))
-;;        (#"ab\\d{0}e" #"ab1e   " #f)
-;;        (#"\"([^\\\\\"]+|\\\\.)*\"" #"the \\\"quick\\\" brown fox" #f)
-;;        (#"\"([^\\\\\"]+|\\\\.)*\"" #"\\\"the \\\\\\\"quick\\\\\\\" brown fox\\\" " #f)
+       (#"^[W-]46\\]" #"W46]789 " (#"W46]"))
+       (#"^[W-]46\\]" #"-46]789" (#"-46]"))
+       (#"^[W-]46\\]" #"Wall" #f)
+       (#"^[W-]46\\]" #"Zebra" #f)
+       (#"^[W-]46\\]" #"42" #f)
+       (#"^[W-]46\\]" #"[abcd] " #f)
+       (#"^[W-]46\\]" #"]abcd[" #f)
+       (#"^[W-\\]46]" #"W46]789 " (#"W"))
+       (#"^[W-\\]46]" #"Wall" (#"W"))
+       (#"^[W-\\]46]" #"Zebra" (#"Z"))
+       (#"^[W-\\]46]" #"Xylophone  " (#"X"))
+       (#"^[W-\\]46]" #"42" (#"4"))
+       (#"^[W-\\]46]" #"[abcd] " (#"["))
+       (#"^[W-\\]46]" #"]abcd[" (#"]"))
+       (#"^[W-\\]46]" #"\\\\backslash " (#"\\"))
+       (#"^[W-\\]46]" #"-46]789" #f)
+       (#"^[W-\\]46]" #"well" #f)
+       (#"\\d\\d\\/\\d\\d\\/\\d\\d\\d\\d" #"01/01/2000" (#"01/01/2000"))
+       (#"word (?:[a-zA-Z0-9]+ ){0,10}otherword" #"rd cat dog elephant mussel cow horse canary baboon snake shark otherword" #f)
+       (#"word (?:[a-zA-Z0-9]+ ){0,10}otherword" #"rd cat dog elephant mussel cow horse canary baboon snake shark" #f)
+       (#"word (?:[a-zA-Z0-9]+ ){0,300}otherword" #"rd cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope" #f)
+       (#"^(a){0,0}" #"bcd" (#"" #f))
+       (#"^(a){0,0}" #"abc" (#"" #f))
+       (#"^(a){0,0}" #"aab     " (#"" #f))
+       (#"^(a){0,1}" #"bcd" (#"" #f))
+       (#"^(a){0,1}" #"abc" (#"a" #"a"))
+       (#"^(a){0,1}" #"aab  " (#"a" #"a"))
+       (#"^(a){0,2}" #"bcd" (#"" #f))
+       (#"^(a){0,2}" #"abc" (#"a" #"a"))
+       (#"^(a){0,2}" #"aab  " (#"aa" #"a"))
+       (#"^(a){0,3}" #"bcd" (#"" #f))
+       (#"^(a){0,3}" #"abc" (#"a" #"a"))
+       (#"^(a){0,3}" #"aab" (#"aa" #"a"))
+       (#"^(a){0,3}" #"aaa   " (#"aaa" #"a"))
+       (#"^(a){0,}" #"bcd" (#"" #f))
+       (#"^(a){0,}" #"abc" (#"a" #"a"))
+       (#"^(a){0,}" #"aab" (#"aa" #"a"))
+       (#"^(a){0,}" #"aaa" (#"aaa" #"a"))
+       (#"^(a){0,}" #"aaaaaaaa    " (#"aaaaaaaa" #"a"))
+       (#"^(a){1,1}" #"bcd" #f)
+       (#"^(a){1,1}" #"abc" (#"a" #"a"))
+       (#"^(a){1,1}" #"aab  " (#"a" #"a"))
+       (#"^(a){1,2}" #"bcd" #f)
+       (#"^(a){1,2}" #"abc" (#"a" #"a"))
+       (#"^(a){1,2}" #"aab  " (#"aa" #"a"))
+       (#"^(a){1,3}" #"bcd" #f)
+       (#"^(a){1,3}" #"abc" (#"a" #"a"))
+       (#"^(a){1,3}" #"aab" (#"aa" #"a"))
+       (#"^(a){1,3}" #"aaa   " (#"aaa" #"a"))
+       (#"^(a){1,}" #"bcd" #f)
+       (#"^(a){1,}" #"abc" (#"a" #"a"))
+       (#"^(a){1,}" #"aab" (#"aa" #"a"))
+       (#"^(a){1,}" #"aaa" (#"aaa" #"a"))
+       (#"^(a){1,}" #"aaaaaaaa    " (#"aaaaaaaa" #"a"))
+       (#"^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]" #"123456654321" (#"123456654321"))
+       (#"^\\d\\d\\d\\d\\d\\d\\d\\d\\d\\d\\d\\d" #"123456654321 " (#"123456654321"))
+       (#"^[\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d][\\d]" #"123456654321" (#"123456654321"))
+       (#"^[abc]{12}" #"abcabcabcabc" (#"abcabcabcabc"))
+       (#"^[a-c]{12}" #"abcabcabcabc" (#"abcabcabcabc"))
+       (#"^(a|b|c){12}" #"abcabcabcabc " (#"abcabcabcabc" #"c"))
+       (#"^[abcdefghijklmnopqrstuvwxy0123456789]" #"n" (#"n"))
+       (#"^[abcdefghijklmnopqrstuvwxy0123456789]" #"z " #f)
+       (#"abcde{0,0}" #"abcd" (#"abcd"))
+       (#"abcde{0,0}" #"abce  " #f)
+       (#"ab[cd]{0,0}e" #"abe" (#"abe"))
+       (#"ab[cd]{0,0}e" #"abcde " #f)
+       (#"ab(c){0,0}d" #"abd" (#"abd" #f))
+       (#"ab(c){0,0}d" #"abcd   " #f)
+       (#"a(b*)" #"a" (#"a" #""))
+       (#"a(b*)" #"ab" (#"ab" #"b"))
+       (#"a(b*)" #"abbbb" (#"abbbb" #"bbbb"))
+       (#"a(b*)" #"bbbbb    " #f)
+       (#"ab\\d{0}e" #"abe" (#"abe"))
+       (#"ab\\d{0}e" #"ab1e   " #f)
+       (#"\"([^\\\\\"]+|\\\\.)*\"" #"the \\\"quick\\\" brown fox" #f)
+       (#"\"([^\\\\\"]+|\\\\.)*\"" #"\\\"the \\\\\\\"quick\\\\\\\" brown fox\\\" " #f)
 ;;        (#"(?i:<tr([\\w\\W\\s\\d][^<>]{0,})><TD([\\w\\W\\s\\d][^<>]{0,})>([\\d]{0,}\\.)(.*)((<BR>([\\w\\W\\s\\d][^<>]{0,})|[\\s]{0,}))<\\/a><\\/TD><TD([\\w\\W\\s\\d][^<>]{0,})>([\\w\\W\\s\\d][^<>]{0,})<\\/TD><TD([\\w\\W\\s\\d][^<>]{0,})>([\\w\\W\\s\\d][^<>]{0,})<\\/TD><\\/TR>)" #"R BGCOLOR='#DBE9E9'><TD align=left valign=top>43.<a href='joblist.cfm?JobID=94 6735&Keyword='>Word Processor<BR>(N-1286)</a></TD><TD align=left valign=top>Lega lstaff.com</TD><TD align=left valign=top>CA - Statewide</TD></TR>" #f)
-;;        (#"^(b+?|a){1,2}?c" #"bac" (#"bac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"bbac" (#"bbac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"bbbac" (#"bbbac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"bbbbac" (#"bbbbac" #"a"))
-;;        (#"^(b+?|a){1,2}?c" #"bbbbbac " (#"bbbbbac" #"a"))
-;;        (#"^(b+|a){1,2}?c" #"bac" (#"bac" #"a"))
-;;        (#"^(b+|a){1,2}?c" #"bbac" (#"bbac" #"a"))
-;;        (#"^(b+|a){1,2}?c" #"bbbac" (#"bbbac" #"a"))
-;;        (#"^(b+|a){1,2}?c" #"bbbbac" (#"bbbbac" #"a"))
-;;        (#"^(b+|a){1,2}?c" #"bbbbbac " (#"bbbbbac" #"a"))
-;;        (#"\x0\\{ab\\}" #"\0{ab}" (#"\0{ab}"))
-;;        (#"(A|B)*?CD" #"CD " (#"CD" #f))
-;;        (#"(A|B)*CD" #"CD " (#"CD" #f))
+       (#"^(b+?|a){1,2}?c" #"bac" (#"bac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"bbac" (#"bbac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"bbbac" (#"bbbac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"bbbbac" (#"bbbbac" #"a"))
+       (#"^(b+?|a){1,2}?c" #"bbbbbac " (#"bbbbbac" #"a"))
+       (#"^(b+|a){1,2}?c" #"bac" (#"bac" #"a"))
+       (#"^(b+|a){1,2}?c" #"bbac" (#"bbac" #"a"))
+       (#"^(b+|a){1,2}?c" #"bbbac" (#"bbbac" #"a"))
+       (#"^(b+|a){1,2}?c" #"bbbbac" (#"bbbbac" #"a"))
+       (#"^(b+|a){1,2}?c" #"bbbbbac " (#"bbbbbac" #"a"))
+       (#"\x0\\{ab\\}" #"\0{ab}" (#"\0{ab}"))
+       (#"(A|B)*?CD" #"CD " (#"CD" #f))
+       (#"(A|B)*CD" #"CD " (#"CD" #f))
 ;;        (#"(AB)*?\\1" #"ABABAB" (#"ABAB" #"AB"))
 ;;        (#"(AB)*\\1" #"ABABAB" (#"ABABAB" #"AB"))
 ;;        #"((a{0,5}){0,5}){0,5}[c]"
 ;;        #"((a{0,5}){0,5})*[c]"
 ;;        #"((a{0,5}){0,5})*[c]"
 ;;        #"(\\b)*a"
-;;        (#"(a)*b" #"ab" (#"ab" #"a"))
+       (#"(a)*b" #"ab" (#"ab" #"a"))
 ;;        #"(a|)*b"
 ;;        #"(a|)*b"
 ;;        #"(a|)*b"
 ;;        (#"^(?:(a)|(b))*\\1\\2$" #"abab" (#"abab" #"a" #"b"))
-;;        (#"abc[^x]def" #"abcxabcydef" (#"abcydef"))
+       (#"abc[^x]def" #"abcxabcydef" (#"abcydef"))
 ;;        (#"^(a|\\1x)*$" #"aax" (#"aax" #"ax"))
 ;;        (#"^(a|\\1x)*$" #"aaxa" (#"aaxa" #"a"))
-;;        (#"" #"@{['']}" (#""))
+       (#"" #"@{['']}" (#""))
 ;;        (#"^(?:(a)|(b))*$" #"ab" (#"ab" #"a" #"b"))
-;;        (#"[\0]" #"a" #f)
-;;        (#"[\0]" #"\0" (#"\0"))
-;;        (#"[\1]" #"a" #f)
-;;        (#"[\1]" #"\1" (#"\1"))
+       (#"[\0]" #"a" #f)
+       (#"[\0]" #"\0" (#"\0"))
+       (#"[\1]" #"a" #f)
+       (#"[\1]" #"\1" (#"\1"))
 ;;        (#"\\10()()()()()()()()()()" #"a" #f)
-;;        (#"a(?<=)b" #"ab" (#"ab")) ;; << added "=" to pattern
-;;        (#"(?<=qq)b*" #"aqbbbqqbb" (#"bb")) ;; << added
-;;        (#"(?<=q?q)b*" #"aqbbbqqbb" (#"bbb")) ;; << added
-;;        (#"()" #"a" (#"" #""))
+       (#"a(?<=)b" #"ab" (#"ab")) ;; << added "=" to pattern
+       (#"(?<=qq)b*" #"aqbbbqqbb" (#"bb")) ;; << added
+       (#"(?<=q?q)b*" #"aqbbbqqbb" (#"bbb")) ;; << added
+       (#"()" #"a" (#"" #""))
 ;;        #"[\\x]"
 ;;        #"[\\x]"
 ;;        #"((a)*)*"
-;;        (#"()a\\1" #"a" (#"a" #""))
+       (#"()a\\1" #"a" (#"a" #""))
 ;;        (#"a\\1()" #"a" #f)
+;; SyntaxError: Invalid regular expression: /a(?i:a)a/: Invalid group
 ;;        (#"a(?i:a)a" #"aaa" (#"aaa"))
 ;;        (#"a(?i:a)a" #"aAa" (#"aAa"))
 ;;        (#"a(?i:a)a" #"aAA" #f)
@@ -870,33 +878,33 @@
 ;;        #"[\\d-f]"
 ;;        #"[\\d-f]"
 ;;        #"[\\d-f]"
-;;        (#"[-b\\d]" #"b" (#"b"))
-;;        (#"[-b\\d]" #"c" #f)
-;;        (#"[-b\\d]" #"d" #f)
-;;        (#"[-b\\d]" #"-" (#"-"))
-;;        (#"[-b\\d]" #"1" (#"1"))
-;;        (#"[\\df-]" #"d" #f)
-;;        (#"[\\df-]" #"e" #f)
-;;        (#"[\\df-]" #"f" (#"f"))
-;;        (#"[\\df-]" #"-" (#"-"))
-;;        (#"[\\df-]" #"1" (#"1"))
-;;        (#"[-a-c]" #"-" (#"-"))
-;;        (#"[-a-c]" #"a" (#"a"))
-;;        (#"[-a-c]" #"b" (#"b"))
-;;        (#"[-a-c]" #"d" #f)
-;;        (#"[a-c-]" #"-" (#"-"))
-;;        (#"[a-c-]" #"a" (#"a"))
-;;        (#"[a-c-]" #"b" (#"b"))
-;;        (#"[a-c-]" #"d" #f)
-;;        (#"[-]" #"a" #f)
-;;        (#"[-]" #"-" (#"-"))
-;;        (#"[--]" #"a" #f)
-;;        (#"[--]" #"-" (#"-"))
+       (#"[-b\\d]" #"b" (#"b"))
+       (#"[-b\\d]" #"c" #f)
+       (#"[-b\\d]" #"d" #f)
+       (#"[-b\\d]" #"-" (#"-"))
+       (#"[-b\\d]" #"1" (#"1"))
+       (#"[\\df-]" #"d" #f)
+       (#"[\\df-]" #"e" #f)
+       (#"[\\df-]" #"f" (#"f"))
+       (#"[\\df-]" #"-" (#"-"))
+       (#"[\\df-]" #"1" (#"1"))
+       (#"[-a-c]" #"-" (#"-"))
+       (#"[-a-c]" #"a" (#"a"))
+       (#"[-a-c]" #"b" (#"b"))
+       (#"[-a-c]" #"d" #f)
+       (#"[a-c-]" #"-" (#"-"))
+       (#"[a-c-]" #"a" (#"a"))
+       (#"[a-c-]" #"b" (#"b"))
+       (#"[a-c-]" #"d" #f)
+       (#"[-]" #"a" #f)
+       (#"[-]" #"-" (#"-"))
+       (#"[--]" #"a" #f)
+       (#"[--]" #"-" (#"-"))
 ;;        #"[---]"
 ;;        #"[--b]"
-;;        (#"[-b-]" #"-" (#"-"))
-;;        (#"[-b-]" #"a" #f)
-;;        (#"[-b-]" #"c" #f)
+       (#"[-b-]" #"-" (#"-"))
+       (#"[-b-]" #"a" #f)
+       (#"[-b-]" #"c" #f)
 ;;        #"a{"
 ;;        (#"a{}" #"aaa" (#""))
 ;;        #"a{3"
@@ -918,11 +926,11 @@
 ;;        #"^a{ 1}$"
 ;;        #"{}"
 ;;        #"{}"
-;;        (#"|" #"x" (#""))
-;;        (#"|x" #"x" (#""))
-;;        (#"x|" #"x" (#"x"))
-;;        (#"\0000" #"\0000" (#"\0\x30"))
-;;        (#"a(?<=)b" #"ab" (#"ab"))
+       (#"|" #"x" (#""))
+       (#"|x" #"x" (#""))
+       (#"x|" #"x" (#"x"))
+       (#"\0000" #"\0000" (#"\0\x30"))
+       (#"a(?<=)b" #"ab" (#"ab"))
 ;;        (#"a(?i:b)" #"ab" (#"ab"))
 ;;        (#"a(?i:b)" #"aB" (#"aB"))
 ;;        (#"a(?i:b)" #"Ab" #f)
@@ -937,35 +945,37 @@
 ;;        #"a(?<=(a))*\\1"
 ;;        #"a(?<=(a))*?\\1"
 ;;        #"(?=(a)\\1)*aa"
-;;        (#"^((a|b){2,5}){2}$" #"aaabbbbb" (#"aaabbbbb" #"bbb" #"b"))
+       (#"^((a|b){2,5}){2}$" #"aaabbbbb" (#"aaabbbbb" #"bbb" #"b"))
 ;;        #"^(b*|ba){1,2}bc"
-;;        (#"^a{4,5}(?:c|a)c$" #"aaac" #f)
-;;        (#"^a{4,5}(?:c|a)c$" #"aaaac" #f)
+       (#"^a{4,5}(?:c|a)c$" #"aaac" #f)
+       (#"^a{4,5}(?:c|a)c$" #"aaaac" #f)
 ;;        #"^(a|){4,5}(?:c|a)c$"
+;; SyntaxError: Invalid regular expression: /(?m:^).abc$/: Invalid group
 ;;        (#"(?m:^).abc$" #"exabc" #f)
 ;;        (#"(?m:^)abc" #"c" #f)
-;;        (#"^abc" #"c" #f)
-;;        (#"(?<!bar)foo" #"foo" (#"foo"))
-;;        (#"(?<!bar)foo" #"catfood" (#"foo"))
-;;        (#"(?<!bar)foo" #"arfootle" (#"foo"))
-;;        (#"(?<!bar)foo" #"rfoosh" (#"foo"))
-;;        (#"(?<!bar)foo" #"barfoo" #f)
-;;        (#"(?<!bar)foo" #"towbarfoo" #f)
-;;        (#"\\w{3}(?<!bar)foo" #"catfood" (#"catfoo"))
-;;        (#"\\w{3}(?<!bar)foo" #"foo" #f)
-;;        (#"\\w{3}(?<!bar)foo" #"barfoo" #f)
-;;        (#"\\w{3}(?<!bar)foo" #"towbarfoo" #f)
-;;        (#"(?<=(foo)a)bar" #"fooabar" (#"bar" #"foo"))
-;;        (#"(?<=(foo)a)bar" #"bar" #f)
-;;        (#"(?<=(foo)a)bar" #"foobbar" #f)
-;;        (#"a(?<=x|ab)b" #"ab" #f)
+       (#"^abc" #"c" #f)
+       (#"(?<!bar)foo" #"foo" (#"foo"))
+       (#"(?<!bar)foo" #"catfood" (#"foo"))
+       (#"(?<!bar)foo" #"arfootle" (#"foo"))
+       (#"(?<!bar)foo" #"rfoosh" (#"foo"))
+       (#"(?<!bar)foo" #"barfoo" #f)
+       (#"(?<!bar)foo" #"towbarfoo" #f)
+       (#"\\w{3}(?<!bar)foo" #"catfood" (#"catfoo"))
+       (#"\\w{3}(?<!bar)foo" #"foo" #f)
+       (#"\\w{3}(?<!bar)foo" #"barfoo" #f)
+       (#"\\w{3}(?<!bar)foo" #"towbarfoo" #f)
+       (#"(?<=(foo)a)bar" #"fooabar" (#"bar" #"foo"))
+       (#"(?<=(foo)a)bar" #"bar" #f)
+       (#"(?<=(foo)a)bar" #"foobbar" #f)
+       (#"a(?<=x|ab)b" #"ab" #f)
+;; SyntaxError: Invalid regular expression: /(?>(\.\d\d[1-9]?))\d+/: Invalid group
 ;;        (#"(?>(\\.\\d\\d[1-9]?))\\d+" #"1.230003938" (#".230003938" #".23"))
 ;;        (#"(?>(\\.\\d\\d[1-9]?))\\d+" #"1.875000282" (#".875000282" #".875"))
 ;;        (#"(?>(\\.\\d\\d[1-9]?))\\d+" #"1.235 " #f)
 ;;        (#"^((?>\\w+)|(?>\\s+))*$" #"now is the time for all good men to come to the aid of the party" (#"now is the time for all good men to come to the aid of the party" #"party"))
 ;;        (#"^((?>\\w+)|(?>\\s+))*$" #"this is not a line with only words and spaces!" #f)
-;;        (#"(\\d+)(\\w)" #"12345a" (#"12345a" #"12345" #"a"))
-;;        (#"(\\d+)(\\w)" #"12345+ " (#"12345" #"1234" #"5"))
+       (#"(\\d+)(\\w)" #"12345a" (#"12345a" #"12345" #"a"))
+       (#"(\\d+)(\\w)" #"12345+ " (#"12345" #"1234" #"5"))
 ;;        (#"((?>\\d+))(\\w)" #"12345a" (#"12345a" #"12345" #"a"))
 ;;        (#"((?>\\d+))(\\w)" #"12345+ " #f)
 ;;        (#"(?>a+)b" #"aaab" (#"aaab"))
@@ -1041,10 +1051,10 @@
 ;;        #"(?>a*)*"
 ;;        #"((?>a*))*"
 ;;        #"((?>a*?))*"
-;;        (#"(?<=(foo))bar\\1" #"foobarfoo" (#"barfoo" #"foo"))
-;;        (#"(?<=(foo))bar\\1" #"foobarfootling " (#"barfoo" #"foo"))
-;;        (#"(?<=(foo))bar\\1" #"foobar" #f)
-;;        (#"(?<=(foo))bar\\1" #"barfoo   " #f)
+       (#"(?<=(foo))bar\\1" #"foobarfoo" (#"barfoo" #"foo"))
+       (#"(?<=(foo))bar\\1" #"foobarfootling " (#"barfoo" #"foo"))
+       (#"(?<=(foo))bar\\1" #"foobar" #f)
+       (#"(?<=(foo))bar\\1" #"barfoo   " #f)
 ;;        (#"(?i:saturday|sunday)" #"saturday" (#"saturday"))
 ;;        (#"(?i:saturday|sunday)" #"sunday" (#"sunday"))
 ;;        (#"(?i:saturday|sunday)" #"Saturday" (#"Saturday"))
@@ -1076,201 +1086,204 @@
 ;;        (#"^(ab|a(?i:[b-c](?m-i:d))|(?m-i:x(?i:y))|(?i:z))" #"Zambesi" (#"Z" #"Z"))
 ;;        (#"^(ab|a(?i:[b-c](?m-i:d))|(?m-i:x(?i:y))|(?i:z))" #"aCD  " #f)
 ;;        (#"^(ab|a(?i:[b-c](?m-i:d))|(?m-i:x(?i:y))|(?i:z))" #"XY  " #f)
-;;        (#"(?<=(?<!foo)bar)baz" #"barbaz" (#"baz"))
-;;        (#"(?<=(?<!foo)bar)baz" #"barbarbaz " (#"baz"))
-;;        (#"(?<=(?<!foo)bar)baz" #"koobarbaz " (#"baz"))
-;;        (#"(?<=(?<!foo)bar)baz" #"baz" #f)
-;;        (#"(?<=(?<!foo)bar)baz" #"foobarbaz " #f)
-;;        (#"^(a\\1?){4}$" #"a" #f)
-;;        (#"^(a\\1?){4}$" #"aa" #f)
-;;        (#"^(a\\1?){4}$" #"aaa" #f)
-;;        (#"^(a\\1?){4}$" #"aaaa" (#"aaaa" #"a"))
+       (#"(?<=(?<!foo)bar)baz" #"barbaz" (#"baz"))
+       (#"(?<=(?<!foo)bar)baz" #"barbarbaz " (#"baz"))
+       (#"(?<=(?<!foo)bar)baz" #"koobarbaz " (#"baz"))
+       (#"(?<=(?<!foo)bar)baz" #"baz" #f)
+       (#"(?<=(?<!foo)bar)baz" #"foobarbaz " #f)
+       (#"^(a\\1?){4}$" #"a" #f)
+       (#"^(a\\1?){4}$" #"aa" #f)
+       (#"^(a\\1?){4}$" #"aaa" #f)
+       (#"^(a\\1?){4}$" #"aaaa" (#"aaaa" #"a"))
+       ;; not sure why some of these match and some dont
+       ;; js regexp is weird?
+       ;; every other lang matches: https://regex101.com/r/Kwbps1/1
 ;;        (#"^(a\\1?){4}$" #"aaaaa" (#"aaaaa" #"a"))
 ;;        (#"^(a\\1?){4}$" #"aaaaaa" (#"aaaaaa" #"aa"))
 ;;        (#"^(a\\1?){4}$" #"aaaaaaa" (#"aaaaaaa" #"a"))
-;;        (#"^(a\\1?){4}$" #"aaaaaaaa" #f)
-;;        (#"^(a\\1?){4}$" #"aaaaaaaaa" #f)
+        (#"^(a\\1?){4}$" #"aaaaaaaa" #f)
+        (#"^(a\\1?){4}$" #"aaaaaaaaa" #f)
 ;;        (#"^(a\\1?){4}$" #"aaaaaaaaaa" (#"aaaaaaaaaa" #"aaaa"))
-;;        (#"^(a\\1?){4}$" #"aaaaaaaaaaa" #f)
-;;        (#"^(a\\1?){4}$" #"aaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?){4}$" #"aaaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?){4}$" #"aaaaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?){4}$" #"aaaaaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?){4}$" #"aaaaaaaaaaaaaaaa               " #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"a" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaa" (#"aaaa" #"a" #"a" #"a" #"a"))
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaa" (#"aaaaa" #"a" #"aa" #"a" #"a"))
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaa" (#"aaaaaa" #"a" #"aa" #"a" #"aa"))
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaa" (#"aaaaaaa" #"a" #"aa" #"aaa" #"a"))
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaa" (#"aaaaaaaaaa" #"a" #"aa" #"aaa" #"aaaa"))
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaaaa" #f)
-;;        (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaaaaa               " #f)
-;;        (#"abc" #"abc" (#"abc"))
-;;        (#"abc" #"xabcy" (#"abc"))
-;;        (#"abc" #"ababc" (#"abc"))
-;;        (#"abc" #"xbc" #f)
-;;        (#"abc" #"axc" #f)
-;;        (#"abc" #"abx" #f)
-;;        (#"ab*c" #"abc" (#"abc"))
-;;        (#"ab*bc" #"abc" (#"abc"))
-;;        (#"ab*bc" #"abbc" (#"abbc"))
-;;        (#"ab*bc" #"abbbbc" (#"abbbbc"))
-;;        (#".{1}" #"abbbbc" (#"a"))
-;;        (#".{3,4}" #"abbbbc" (#"abbb"))
-;;        (#"ab{0,}bc" #"abbbbc" (#"abbbbc"))
-;;        (#"ab+bc" #"abbc" (#"abbc"))
-;;        (#"ab+bc" #"abc" #f)
-;;        (#"ab+bc" #"abq" #f)
-;;        (#"ab+bc" #"abbbbc" (#"abbbbc"))
-;;        (#"ab{1,}bc" #"abbbbc" (#"abbbbc"))
-;;        (#"ab{1,3}bc" #"abbbbc" (#"abbbbc"))
-;;        (#"ab{3,4}bc" #"abbbbc" (#"abbbbc"))
-;;        (#"ab{4,5}bc" #"abq" #f)
-;;        (#"ab{4,5}bc" #"abbbbc" #f)
-;;        (#"ab?bc" #"abbc" (#"abbc"))
-;;        (#"ab?bc" #"abc" (#"abc"))
-;;        (#"ab{0,1}bc" #"abc" (#"abc"))
-;;        (#"ab?c" #"abc" (#"abc"))
-;;        (#"ab{0,1}c" #"abc" (#"abc"))
-;;        (#"^abc$" #"abc" (#"abc"))
-;;        (#"^abc$" #"abbbbc" #f)
-;;        (#"^abc$" #"abcc" #f)
-;;        (#"^abc" #"abcc" (#"abc"))
-;;        (#"abc$" #"aabc" (#"abc"))
-;;        (#"abc$" #"aabc" (#"abc"))
-;;        (#"abc$" #"aabcd" #f)
-;;        (#"^" #"abc" (#""))
-;;        (#"$" #"abc" (#""))
-;;        (#"a.c" #"abc" (#"abc"))
-;;        (#"a.c" #"axc" (#"axc"))
-;;        (#"a.*c" #"axyzc" (#"axyzc"))
-;;        (#"a[bc]d" #"abd" (#"abd"))
-;;        (#"a[bc]d" #"axyzd" #f)
-;;        (#"a[bc]d" #"abc" #f)
-;;        (#"a[b-d]e" #"ace" (#"ace"))
-;;        (#"a[b-d]" #"aac" (#"ac"))
-;;        (#"a[-b]" #"a-" (#"a-"))
-;;        (#"a[b-]" #"a-" (#"a-"))
+       (#"^(a\\1?){4}$" #"aaaaaaaaaaa" #f)
+       (#"^(a\\1?){4}$" #"aaaaaaaaaaaa" #f)
+       (#"^(a\\1?){4}$" #"aaaaaaaaaaaaa" #f)
+       (#"^(a\\1?){4}$" #"aaaaaaaaaaaaaa" #f)
+       (#"^(a\\1?){4}$" #"aaaaaaaaaaaaaaa" #f)
+       (#"^(a\\1?){4}$" #"aaaaaaaaaaaaaaaa               " #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"a" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaa" (#"aaaa" #"a" #"a" #"a" #"a"))
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaa" (#"aaaaa" #"a" #"aa" #"a" #"a"))
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaa" (#"aaaaaa" #"a" #"aa" #"a" #"aa"))
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaa" (#"aaaaaaa" #"a" #"aa" #"aaa" #"a"))
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaa" (#"aaaaaaaaaa" #"a" #"aa" #"aaa" #"aaaa"))
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaaaa" #f)
+       (#"^(a\\1?)(a\\1?)(a\\2?)(a\\3?)$" #"aaaaaaaaaaaaaaaa               " #f)
+       (#"abc" #"abc" (#"abc"))
+       (#"abc" #"xabcy" (#"abc"))
+       (#"abc" #"ababc" (#"abc"))
+       (#"abc" #"xbc" #f)
+       (#"abc" #"axc" #f)
+       (#"abc" #"abx" #f)
+       (#"ab*c" #"abc" (#"abc"))
+       (#"ab*bc" #"abc" (#"abc"))
+       (#"ab*bc" #"abbc" (#"abbc"))
+       (#"ab*bc" #"abbbbc" (#"abbbbc"))
+       (#".{1}" #"abbbbc" (#"a"))
+       (#".{3,4}" #"abbbbc" (#"abbb"))
+       (#"ab{0,}bc" #"abbbbc" (#"abbbbc"))
+       (#"ab+bc" #"abbc" (#"abbc"))
+       (#"ab+bc" #"abc" #f)
+       (#"ab+bc" #"abq" #f)
+       (#"ab+bc" #"abbbbc" (#"abbbbc"))
+       (#"ab{1,}bc" #"abbbbc" (#"abbbbc"))
+       (#"ab{1,3}bc" #"abbbbc" (#"abbbbc"))
+       (#"ab{3,4}bc" #"abbbbc" (#"abbbbc"))
+       (#"ab{4,5}bc" #"abq" #f)
+       (#"ab{4,5}bc" #"abbbbc" #f)
+       (#"ab?bc" #"abbc" (#"abbc"))
+       (#"ab?bc" #"abc" (#"abc"))
+       (#"ab{0,1}bc" #"abc" (#"abc"))
+       (#"ab?c" #"abc" (#"abc"))
+       (#"ab{0,1}c" #"abc" (#"abc"))
+       (#"^abc$" #"abc" (#"abc"))
+       (#"^abc$" #"abbbbc" #f)
+       (#"^abc$" #"abcc" #f)
+       (#"^abc" #"abcc" (#"abc"))
+       (#"abc$" #"aabc" (#"abc"))
+       (#"abc$" #"aabc" (#"abc"))
+       (#"abc$" #"aabcd" #f)
+       (#"^" #"abc" (#""))
+       (#"$" #"abc" (#""))
+       (#"a.c" #"abc" (#"abc"))
+       (#"a.c" #"axc" (#"axc"))
+       (#"a.*c" #"axyzc" (#"axyzc"))
+       (#"a[bc]d" #"abd" (#"abd"))
+       (#"a[bc]d" #"axyzd" #f)
+       (#"a[bc]d" #"abc" #f)
+       (#"a[b-d]e" #"ace" (#"ace"))
+       (#"a[b-d]" #"aac" (#"ac"))
+       (#"a[-b]" #"a-" (#"a-"))
+       (#"a[b-]" #"a-" (#"a-"))
 ;;        #"a]"
 ;;        (#"a[]]" #"a]" (#"a]"))
 ;;        (#"a[]]b" #"a]b" (#"a]b"))
-;;        (#"a[^bc]d" #"aed" (#"aed"))
-;;        (#"a[^bc]d" #"abd" #f)
-;;        (#"a[^bc]d" #"abd" #f)
-;;        (#"a[^-b]c" #"adc" (#"adc"))
+       (#"a[^bc]d" #"aed" (#"aed"))
+       (#"a[^bc]d" #"abd" #f)
+       (#"a[^bc]d" #"abd" #f)
+       (#"a[^-b]c" #"adc" (#"adc"))
 ;;        (#"a[^]b]c" #"adc" (#"adc"))
 ;;        (#"a[^]b]c" #"a-c" (#"a-c"))
 ;;        (#"a[^]b]c" #"a]c" #f)
-;;        (#"\\ba\\b" #"a-" (#"a"))
-;;        (#"\\ba\\b" #"-a" (#"a"))
-;;        (#"\\ba\\b" #"-a-" (#"a"))
-;;        (#"\\by\\b" #"xy" #f)
-;;        (#"\\by\\b" #"yz" #f)
-;;        (#"\\by\\b" #"xyz" #f)
-;;        (#"\\Ba\\B" #"a-" #f)
-;;        (#"\\Ba\\B" #"-a" #f)
-;;        (#"\\Ba\\B" #"-a-" #f)
-;;        (#"\\By\\b" #"xy" (#"y"))
-;;        (#"\\by\\B" #"yz" (#"y"))
-;;        (#"\\By\\B" #"xyz" (#"y"))
-;;        (#"\\w" #"a" (#"a"))
-;;        (#"\\W" #"-" (#"-"))
-;;        (#"\\W" #"-" (#"-"))
-;;        (#"\\W" #"a" #f)
-;;        (#"a\\sb" #"a b" (#"a b"))
-;;        (#"a\\Sb" #"a-b" (#"a-b"))
-;;        (#"a\\Sb" #"a-b" (#"a-b"))
-;;        (#"a\\Sb" #"a b" #f)
-;;        (#"\\d" #"1" (#"1"))
-;;        (#"\\D" #"-" (#"-"))
-;;        (#"\\D" #"-" (#"-"))
-;;        (#"\\D" #"1" #f)
-;;        (#"[\\w]" #"a" (#"a"))
-;;        (#"[\\W]" #"-" (#"-"))
-;;        (#"[\\W]" #"-" (#"-"))
-;;        (#"[\\W]" #"a" #f)
-;;        (#"a[\\s]b" #"a b" (#"a b"))
-;;        (#"a[\\S]b" #"a-b" (#"a-b"))
-;;        (#"a[\\S]b" #"a-b" (#"a-b"))
-;;        (#"a[\\S]b" #"a b" #f)
-;;        (#"[\\d]" #"1" (#"1"))
-;;        (#"[\\D]" #"-" (#"-"))
-;;        (#"[\\D]" #"-" (#"-"))
-;;        (#"[\\D]" #"1" #f)
-;;        (#"ab|cd" #"abc" (#"ab"))
-;;        (#"ab|cd" #"abcd" (#"ab"))
-;;        (#"()ef" #"def" (#"ef" #""))
-;;        (#"a\\(b" #"a(b" (#"a(b"))
-;;        (#"a\\(*b" #"ab" (#"ab"))
-;;        (#"a\\(*b" #"a((b" (#"a((b"))
-;;        (#"a\\\\b" #"a\\b" (#"a\\b"))
-;;        (#"((a))" #"abc" (#"a" #"a" #"a"))
-;;        (#"(a)b(c)" #"abc" (#"abc" #"a" #"c"))
-;;        (#"a+b+c" #"aabbabc" (#"abc"))
-;;        (#"a{1,}b{1,}c" #"aabbabc" (#"abc"))
-;;        (#"a.+?c" #"abcabc" (#"abc"))
-;;        (#"(a+|b)*" #"ab" (#"ab" #"b"))
-;;        (#"(a+|b){0,}" #"ab" (#"ab" #"b"))
-;;        (#"(a+|b)+" #"ab" (#"ab" #"b"))
-;;        (#"(a+|b){1,}" #"ab" (#"ab" #"b"))
-;;        (#"(a+|b)?" #"ab" (#"a" #"a"))
-;;        (#"(a+|b){0,1}" #"ab" (#"a" #"a"))
-;;        (#"[^ab]*" #"cde" (#"cde"))
-;;        (#"abc" #"b" #f)
-;;        (#"([abc])*d" #"abbbcd" (#"abbbcd" #"c"))
-;;        (#"([abc])*bcd" #"abcd" (#"abcd" #"a"))
-;;        (#"a|b|c|d|e" #"e" (#"e"))
-;;        (#"(a|b|c|d|e)f" #"ef" (#"ef" #"e"))
-;;        (#"abcd*efg" #"abcdefg" (#"abcdefg"))
-;;        (#"ab*" #"xabyabbbz" (#"ab"))
-;;        (#"ab*" #"xayabbbz" (#"a"))
-;;        (#"(ab|cd)e" #"abcde" (#"cde" #"cd"))
-;;        (#"[abhgefdc]ij" #"hij" (#"hij"))
-;;        (#"(abc|)ef" #"abcdef" (#"ef" #""))
-;;        (#"(a|b)c*d" #"abcd" (#"bcd" #"b"))
-;;        (#"(ab|ab*)bc" #"abc" (#"abc" #"a"))
-;;        (#"a([bc]*)c*" #"abc" (#"abc" #"bc"))
-;;        (#"a([bc]*)(c*d)" #"abcd" (#"abcd" #"bc" #"d"))
-;;        (#"a([bc]+)(c*d)" #"abcd" (#"abcd" #"bc" #"d"))
-;;        (#"a([bc]*)(c+d)" #"abcd" (#"abcd" #"b" #"cd"))
-;;        (#"a[bcd]*dcdcde" #"adcdcde" (#"adcdcde"))
-;;        (#"a[bcd]+dcdcde" #"abcde" #f)
-;;        (#"a[bcd]+dcdcde" #"adcdcde" #f)
-;;        (#"(ab|a)b*c" #"abc" (#"abc" #"ab"))
-;;        (#"((a)(b)c)(d)" #"abcd" (#"abcd" #"abc" #"a" #"b" #"d"))
-;;        (#"[a-zA-Z_][a-zA-Z0-9_]*" #"alpha" (#"alpha"))
-;;        (#"^a(bc+|b[eh])g|.h$" #"abh" (#"bh" #f))
-;;        (#"(bc+d$|ef*g.|h?i(j|k))" #"effgz" (#"effgz" #"effgz" #f))
-;;        (#"(bc+d$|ef*g.|h?i(j|k))" #"ij" (#"ij" #"ij" #"j"))
-;;        (#"(bc+d$|ef*g.|h?i(j|k))" #"reffgz" (#"effgz" #"effgz" #f))
-;;        (#"(bc+d$|ef*g.|h?i(j|k))" #"effg" #f)
-;;        (#"(bc+d$|ef*g.|h?i(j|k))" #"bcdd" #f)
-;;        (#"((((((((((a))))))))))" #"a" (#"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a"))
-;;        (#"((((((((((a))))))))))\\10" #"aa" (#"aa" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a"))
-;;        (#"(((((((((a)))))))))" #"a" (#"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a"))
-;;        (#"multiple words of text" #"aa" #f)
-;;        (#"multiple words of text" #"uh-uh" #f)
-;;        (#"multiple words" #"multiple words, yeah" (#"multiple words"))
-;;        (#"(.*)c(.*)" #"abcde" (#"abcde" #"ab" #"de"))
-;;        (#"\\((.*), (.*)\\)" #"(a, b)" (#"(a, b)" #"a" #"b"))
-;;        (#"abcd" #"abcd" (#"abcd"))
-;;        (#"a(bc)d" #"abcd" (#"abcd" #"bc"))
-;;        (#"a[-]?c" #"ac" (#"ac"))
-;;        (#"(abc)\\1" #"abcabc" (#"abcabc" #"abc"))
-;;        (#"([a-c]*)\\1" #"abcabc" (#"abcabc" #"abc"))
-;;        (#"(a)|\\1" #"a" (#"a" #"a"))
-;;        (#"(a)|\\1" #"ab" (#"a" #"a"))
+       (#"\\ba\\b" #"a-" (#"a"))
+       (#"\\ba\\b" #"-a" (#"a"))
+       (#"\\ba\\b" #"-a-" (#"a"))
+       (#"\\by\\b" #"xy" #f)
+       (#"\\by\\b" #"yz" #f)
+       (#"\\by\\b" #"xyz" #f)
+       (#"\\Ba\\B" #"a-" #f)
+       (#"\\Ba\\B" #"-a" #f)
+       (#"\\Ba\\B" #"-a-" #f)
+       (#"\\By\\b" #"xy" (#"y"))
+       (#"\\by\\B" #"yz" (#"y"))
+       (#"\\By\\B" #"xyz" (#"y"))
+       (#"\\w" #"a" (#"a"))
+       (#"\\W" #"-" (#"-"))
+       (#"\\W" #"-" (#"-"))
+       (#"\\W" #"a" #f)
+       (#"a\\sb" #"a b" (#"a b"))
+       (#"a\\Sb" #"a-b" (#"a-b"))
+       (#"a\\Sb" #"a-b" (#"a-b"))
+       (#"a\\Sb" #"a b" #f)
+       (#"\\d" #"1" (#"1"))
+       (#"\\D" #"-" (#"-"))
+       (#"\\D" #"-" (#"-"))
+       (#"\\D" #"1" #f)
+       (#"[\\w]" #"a" (#"a"))
+       (#"[\\W]" #"-" (#"-"))
+       (#"[\\W]" #"-" (#"-"))
+       (#"[\\W]" #"a" #f)
+       (#"a[\\s]b" #"a b" (#"a b"))
+       (#"a[\\S]b" #"a-b" (#"a-b"))
+       (#"a[\\S]b" #"a-b" (#"a-b"))
+       (#"a[\\S]b" #"a b" #f)
+       (#"[\\d]" #"1" (#"1"))
+       (#"[\\D]" #"-" (#"-"))
+       (#"[\\D]" #"-" (#"-"))
+       (#"[\\D]" #"1" #f)
+       (#"ab|cd" #"abc" (#"ab"))
+       (#"ab|cd" #"abcd" (#"ab"))
+       (#"()ef" #"def" (#"ef" #""))
+       (#"a\\(b" #"a(b" (#"a(b"))
+       (#"a\\(*b" #"ab" (#"ab"))
+       (#"a\\(*b" #"a((b" (#"a((b"))
+       (#"a\\\\b" #"a\\b" (#"a\\b"))
+       (#"((a))" #"abc" (#"a" #"a" #"a"))
+       (#"(a)b(c)" #"abc" (#"abc" #"a" #"c"))
+       (#"a+b+c" #"aabbabc" (#"abc"))
+       (#"a{1,}b{1,}c" #"aabbabc" (#"abc"))
+       (#"a.+?c" #"abcabc" (#"abc"))
+       (#"(a+|b)*" #"ab" (#"ab" #"b"))
+       (#"(a+|b){0,}" #"ab" (#"ab" #"b"))
+       (#"(a+|b)+" #"ab" (#"ab" #"b"))
+       (#"(a+|b){1,}" #"ab" (#"ab" #"b"))
+       (#"(a+|b)?" #"ab" (#"a" #"a"))
+       (#"(a+|b){0,1}" #"ab" (#"a" #"a"))
+       (#"[^ab]*" #"cde" (#"cde"))
+       (#"abc" #"b" #f)
+       (#"([abc])*d" #"abbbcd" (#"abbbcd" #"c"))
+       (#"([abc])*bcd" #"abcd" (#"abcd" #"a"))
+       (#"a|b|c|d|e" #"e" (#"e"))
+       (#"(a|b|c|d|e)f" #"ef" (#"ef" #"e"))
+       (#"abcd*efg" #"abcdefg" (#"abcdefg"))
+       (#"ab*" #"xabyabbbz" (#"ab"))
+       (#"ab*" #"xayabbbz" (#"a"))
+       (#"(ab|cd)e" #"abcde" (#"cde" #"cd"))
+       (#"[abhgefdc]ij" #"hij" (#"hij"))
+       (#"(abc|)ef" #"abcdef" (#"ef" #""))
+       (#"(a|b)c*d" #"abcd" (#"bcd" #"b"))
+       (#"(ab|ab*)bc" #"abc" (#"abc" #"a"))
+       (#"a([bc]*)c*" #"abc" (#"abc" #"bc"))
+       (#"a([bc]*)(c*d)" #"abcd" (#"abcd" #"bc" #"d"))
+       (#"a([bc]+)(c*d)" #"abcd" (#"abcd" #"bc" #"d"))
+       (#"a([bc]*)(c+d)" #"abcd" (#"abcd" #"b" #"cd"))
+       (#"a[bcd]*dcdcde" #"adcdcde" (#"adcdcde"))
+       (#"a[bcd]+dcdcde" #"abcde" #f)
+       (#"a[bcd]+dcdcde" #"adcdcde" #f)
+       (#"(ab|a)b*c" #"abc" (#"abc" #"ab"))
+       (#"((a)(b)c)(d)" #"abcd" (#"abcd" #"abc" #"a" #"b" #"d"))
+       (#"[a-zA-Z_][a-zA-Z0-9_]*" #"alpha" (#"alpha"))
+       (#"^a(bc+|b[eh])g|.h$" #"abh" (#"bh" #f))
+       (#"(bc+d$|ef*g.|h?i(j|k))" #"effgz" (#"effgz" #"effgz" #f))
+       (#"(bc+d$|ef*g.|h?i(j|k))" #"ij" (#"ij" #"ij" #"j"))
+       (#"(bc+d$|ef*g.|h?i(j|k))" #"reffgz" (#"effgz" #"effgz" #f))
+       (#"(bc+d$|ef*g.|h?i(j|k))" #"effg" #f)
+       (#"(bc+d$|ef*g.|h?i(j|k))" #"bcdd" #f)
+       (#"((((((((((a))))))))))" #"a" (#"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a"))
+       (#"((((((((((a))))))))))\\10" #"aa" (#"aa" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a"))
+       (#"(((((((((a)))))))))" #"a" (#"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a" #"a"))
+       (#"multiple words of text" #"aa" #f)
+       (#"multiple words of text" #"uh-uh" #f)
+       (#"multiple words" #"multiple words, yeah" (#"multiple words"))
+       (#"(.*)c(.*)" #"abcde" (#"abcde" #"ab" #"de"))
+       (#"\\((.*), (.*)\\)" #"(a, b)" (#"(a, b)" #"a" #"b"))
+       (#"abcd" #"abcd" (#"abcd"))
+       (#"a(bc)d" #"abcd" (#"abcd" #"bc"))
+       (#"a[-]?c" #"ac" (#"ac"))
+       (#"(abc)\\1" #"abcabc" (#"abcabc" #"abc"))
+       (#"([a-c]*)\\1" #"abcabc" (#"abcabc" #"abc"))
+       (#"(a)|\\1" #"a" (#"a" #"a"))
+       (#"(a)|\\1" #"ab" (#"a" #"a"))
 ;;        (#"(a)|\\1" #"x" #f)
-;;        (#"(([a-c])b*?\\2)*" #"ababbbcbc" (#"ababb" #"bb" #"b"))
-;;        (#"(([a-c])b*?\\2){3}" #"ababbbcbc" (#"ababbbcbc" #"cbc" #"c"))
+       (#"(([a-c])b*?\\2)*" #"ababbbcbc" (#"ababb" #"bb" #"b"))
+       (#"(([a-c])b*?\\2){3}" #"ababbbcbc" (#"ababbbcbc" #"cbc" #"c"))
 ;;        (#"((\\3|b)\\2(a)x)+" #"aaaxabaxbaaxbbax" (#"bbax" #"bbax" #"b" #"a"))
 ;;        (#"((\\3|b)\\2(a)){2,}" #"bbaababbabaaaaabbaaaabba" (#"bbaaaabba" #"bba" #"b" #"a"))
 ;;        (#"(?i:abc)" #"ABC" (#"ABC"))
@@ -1622,7 +1635,8 @@
 ;;        (#"^(E)?(?(1)aa|a)*$" #"Eaaa" #f)
 ;;        (#"^(E)?(?(1)aa|a)*$" #"Eaaaa" (#"Eaaaa" #"E"))
 ;;        (#"^(E)?(?(1)aa|a)*$" #"aaa" (#"aaa" #f))
-;;        (#"^(E)?(?(1)aa|a)*$" #"aaaa" (#"aaaa" #f))))
+             ;;        (#"^(E)?(?(1)aa|a)*$" #"aaaa" (#"aaaa" #f))
+             ))
 
 ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; ;;  Test unicode-property patterns
diff --git a/tests/struct/p.rkt b/tests/struct/p.rkt
new file mode 100644
index 00000000..c21c35ff
--- /dev/null
+++ b/tests/struct/p.rkt
@@ -0,0 +1,10 @@
+#lang racket/base
+
+;; this is imported by super-required.rkt, see pr #272
+
+;; get "set-p-val! not defined err" if field name is included in this provide
+(#%provide (struct p ()))
+
+(define-struct p (val))
+(displayln (p 3))
+(displayln (p-val (p 3)))
diff --git a/tests/struct/super-required.rkt b/tests/struct/super-required.rkt
new file mode 100644
index 00000000..d2facf6a
--- /dev/null
+++ b/tests/struct/super-required.rkt
@@ -0,0 +1,14 @@
+#lang racket/base
+
+(require "p.rkt")
+
+;; fixes pr #272
+;; was getting arity mismatch err bc imported super struct's fields are counted
+;; (there are subsequent errors as well if arity check is disabled)
+;; (real-world example where this shows up is promises)
+(define-struct (p2 p) ())
+(displayln (p2 1))
+(displayln (p 2))
+(displayln (p? (p 2)))
+(displayln (p? (make-p 2)))
+(displayln (p? (p2 2)))
diff --git a/tests/test-utils.rkt b/tests/test-utils.rkt
index 2bd5796e..5dace3c4 100644
--- a/tests/test-utils.rkt
+++ b/tests/test-utils.rkt
@@ -1,6 +1,10 @@
 #lang racket/base
-(require (for-syntax racket/base syntax/parse version/utils)
+
+(require (for-syntax racket/base
+                     syntax/parse
+                     version/utils)
          syntax/parse/define)
+
 (provide (all-defined-out))
 
 (define-syntax (run-if-version stx)