Attached v2 of patch where mixing str and binary data for altchars or map01 raises TypeError.

I also added a note for each of the changed functions that it also accepts strings (but didn't also update the docstrings).

When writing the docs, the new functionality seemed hard to describe; maybe that means this issue only complicates things and is not worth it, or maybe it just means I don't have experience at writing docs.

But, regardless of having worked at a patch, I have to admit that I'm also not 100% sure this issue is a good idea. I *do* think that either both this issue and #13637 should be accepted or both rejected.