pathlib.PurePath.with_name() rejects names with NTFS alternate data streams; accepts '.'

[barneygale]

Bug report

This shouldn't raise an exception:

>>> pathlib.PureWindowsPath('foo', 'a').with_name('a:b')
ValueError: Invalid name 'a:b'

(affects all versions of pathlib)

This should raise an exception:

>>> pathlib.PurePath('foo', 'a').with_name('.')
PurePosixPath('foo/.')

(affects 3.12 and up)

Linked PRs

• GH-110488: Fix two small issues in pathlib.PurePath.with_name() #110651
• [3.12] GH-110488: Fix two small issues in pathlib.PurePath.with_name() (GH-110651) #110678

[barneygale]

Removing the 3.11 tag as pathlib in Python 3.11 doesn't properly support NTFS alternate data streams, see #80486.