gh-41779: Allow defining any __slots__ for a class derived from tuple

[serhiy-storchaka]

• Issue: gh-41779

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📚 Documentation preview 📚: https://cpython-previews--141763.org.readthedocs.build/

[encukou]

@markshannon Is this compatible with the laout you had in mind for the “Grand Unified Python Object Layout”?

[serhiy-storchaka]

Let's merge this, and fix possible issues if they occur later.

[bedevere-bot]

:warning::warning::warning: Buildbot failure :warning::warning::warning:

Hi! The buildbot ARM64 macOS 3.x (tier-2) has failed when building commit 4d21297d288f17c0db775605e2543749840e46b2.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/725/builds/12464) and take a look at the build logs.
4. Check if the failure is related to this commit (4d21297d288f17c0db775605e2543749840e46b2) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/725/builds/12464

Failed tests:

• test_urllib2net

Summary of the results of the build (if available):

==

Click to see traceback logs

remote: Enumerating objects: 24, done.        
remote: Counting objects:   4% (1/23)        
remote: Counting objects:   8% (2/23)        
remote: Counting objects:  13% (3/23)        
remote: Counting objects:  17% (4/23)        
remote: Counting objects:  21% (5/23)        
remote: Counting objects:  26% (6/23)        
remote: Counting objects:  30% (7/23)        
remote: Counting objects:  34% (8/23)        
remote: Counting objects:  39% (9/23)        
remote: Counting objects:  43% (10/23)        
remote: Counting objects:  47% (11/23)        
remote: Counting objects:  52% (12/23)        
remote: Counting objects:  56% (13/23)        
remote: Counting objects:  60% (14/23)        
remote: Counting objects:  65% (15/23)        
remote: Counting objects:  69% (16/23)        
remote: Counting objects:  73% (17/23)        
remote: Counting objects:  78% (18/23)        
remote: Counting objects:  82% (19/23)        
remote: Counting objects:  86% (20/23)        
remote: Counting objects:  91% (21/23)        
remote: Counting objects:  95% (22/23)        
remote: Counting objects: 100% (23/23)        
remote: Counting objects: 100% (23/23), done.        
remote: Compressing objects:   5% (1/20)        
remote: Compressing objects:  10% (2/20)        
remote: Compressing objects:  15% (3/20)        
remote: Compressing objects:  20% (4/20)        
remote: Compressing objects:  25% (5/20)        
remote: Compressing objects:  30% (6/20)        
remote: Compressing objects:  35% (7/20)        
remote: Compressing objects:  40% (8/20)        
remote: Compressing objects:  45% (9/20)        
remote: Compressing objects:  50% (10/20)        
remote: Compressing objects:  55% (11/20)        
remote: Compressing objects:  60% (12/20)        
remote: Compressing objects:  65% (13/20)        
remote: Compressing objects:  70% (14/20)        
remote: Compressing objects:  75% (15/20)        
remote: Compressing objects:  80% (16/20)        
remote: Compressing objects:  85% (17/20)        
remote: Compressing objects:  90% (18/20)        
remote: Compressing objects:  95% (19/20)        
remote: Compressing objects: 100% (20/20)        
remote: Compressing objects: 100% (20/20), done.        
remote: Total 24 (delta 3), reused 3 (delta 3), pack-reused 1 (from 1)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
Note: switching to '4d21297d288f17c0db775605e2543749840e46b2'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 4d21297d288 gh-41779: Allow defining any __slots__ for a class derived from tuple (GH-141763)
Switched to and reset branch 'main'

make: *** [buildbottest] Error 2