Allow path-like objects in `fnmatch.filter` on POSIX platforms

[picnixz]

In fnmatch.filter, it says that

# normcase on posix is NOP. Optimize it away from the loop.

This is not the case. os.path.normcase actually calls os.fspath on POSIX, meaning that path-like objects are allowed. Thus, we cannot optimize it away from the loop. I'll update #123122 accordingly.

Related: #123122 (comment)

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-123135: add support for path-like objects in fnmatch.filter on POSIX platforms #123122

[picnixz]

Marking this one as a feature instead of a bugfix (hence it will only be included in 3.14 and not backported). See #123122 (comment).

[picnixz]

See #123215 (comment) for the rationale of closing this issue as not planned for now.