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I am glad this is finally happening. There's quite a bit of noise in the thread which I have to ignore. The two issues that I want to respond to are speed and whether os.fspath() can return bytes.

- Speed: We should trust our ability to optimize the implementations where necessary. First the API issues need to be settled.

- Bytes: I strongly believe that os.fspath() should be a thin wrapper around the \_\_fspath\_\_ protocol, like next() wraps the .\_\_next\_\_ protocol. It should not get into bytes vs. string politics. If your app really needs strings, call os.fsdecode(). So this is my version (unoptimized):

def fspath(p: Union\[str, bytes, PathLike\]) -> Union\[str, bytes\]:

if isinstance(p, (str, bytes)):

return p

try:

return p.\_\_fspath\_\_

except AttributeError:

raise TypeError(...)

Other than that I think the PEP is already in fine shape.

--Guido van Rossum (python.org/\~guido)