After decoding percentage encoded `name` and `values` in the query string, it tries to `_coerce_result` or encode the result to ascii (which is the value of _implicit_encoding).

```
  File "/usr/lib/python3.6/urllib/parse.py", line 691, in parse_qsl
    value = _coerce_result(value)
  File "/usr/lib/python3.6/urllib/parse.py", line 95, in _encode_result
    return obj.encode(encoding, errors)
UnicodeEncodeError: 'ascii' codec can't encode character '\xe9' in position 1: ordinal not in range(128)
```

As seen in the partial traceback above, it breaks things when trying to parse unicode encode query string values.