Possible missing symlink to `lib64` in user path schema on Linux Fedora 43, Python 3.14.2

Bug report

Bug description:

I'm not sure if this is distribution specific problem or something is broken in the core, so I'm filing it here first. I'm also not sure if it's CPython per se or needs to go into PyPA (pip etc).

Python 3.14.2 (main, Dec 5 2025, 00:00:00) [GCC 15.2.1 20251111 (Red Hat 15.2.1-4)] on linux

>>> pprint.pprint(sysconfig.get_paths("posix_user"))
{'data': '/home/arcivanov/.local',
 'include': '/home/arcivanov/.local/include/python3.14',
 'platlib': '/home/arcivanov/.local/lib/python3.14/site-packages',
 'platstdlib': '/home/arcivanov/.local/lib64/python3.14',
 'purelib': '/home/arcivanov/.local/lib/python3.14/site-packages',
 'scripts': '/home/arcivanov/.local/bin',
 'stdlib': '/home/arcivanov/.local/lib64/python3.14'}
>>> pprint.pprint(sysconfig.get_paths("venv"))
{'data': '/usr',
 'include': '/usr/include/python3.14',
 'platinclude': '/usr/include/python3.14',
 'platlib': '/usr/lib64/python3.14/site-packages',
 'platstdlib': '/usr/lib64/python3.14',
 'purelib': '/usr/lib/python3.14/site-packages',
 'scripts': '/usr/bin',
 'stdlib': '/usr/lib64/python3.14'}
>>> 

Firstly, in the posix_user the platlib goes into lib, whereas in venv everything that isn't pure is going into lib64.

Secondly, in the venv, this doesn't really matter due to there being a symlink from lib64 to lib. However, in the posix_user the lib64 is simply missing from /home/arcivanov/.local/ while being referenced in posix_user schema as something that should exist.

Venv:

drwxr-xr-x 1 arcivanov arcivanov 374 Dec  9 09:34 bin
-rw-r--r-- 1 arcivanov arcivanov  69 Dec  9 09:34 .gitignore
drwxr-xr-x 1 arcivanov arcivanov   0 Dec  9 09:34 include
drwxr-xr-x 1 arcivanov arcivanov  22 Dec  9 09:34 lib
lrwxrwxrwx 1 arcivanov arcivanov   3 Dec  9 09:34 lib64 -> lib
-rw-r--r-- 1 arcivanov arcivanov 305 Dec  9 09:34 pyvenv.cfg

CPython versions tested on:

3.14

Operating systems tested on:

Linux

まず、Linux Fedora 43 上の Python 3.14.2 で報告された sysconfig.get_paths("posix_user") と sysconfig.get_paths("venv") の結果を再現し、その後 user と venv のパススキーマ、および lib/lib64 に対するそれぞれの動作を比較します。posix_user が lib64 を作成すべきか参照すべきかを明らかにし、リポジトリが期待される結果を示している場合は、動作を文書化するか回帰テストで修正できれば完了です。