[issue27186] add os.fspath()

[Brett Cannon]

Brett Cannon added the comment:

I'm starting to catch up on everything you all did for PEP 519 and I wanted to say thanks! It looks like everything that needs to be done has been committed, has a patch, or just needs docs. The only thing I needed to do post-commit is tweak the docstrings to be PEP 8 compatible and reword some documention and docstrings.

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