pathlib.PurePath.stem has a unlisted Python 3.14 change

[kesara]

Documentation

Python 3.14 has a change that "A single dot (”.”) is considered a valid suffix."

This is not listed in pathlib.PurePath.stem documentation.
But Python 3.14 changes what stem returns because single dot is considered a valid suffix.

Python 3.14:

>>> PurePosixPath('my/library.').stem
'library'

Python 3.13:

>>> PurePosixPath('my/library.').stem
'library.'

[cmaloney]

cc: @barneygale

[mpkocher]

https://github.com/python/cpython/blob/3.13/Lib/pathlib/_abc.py#L195C9-L195C13

https://github.com/python/cpython/blob/3.14/Lib/pathlib/__init__.py#L443