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Sync typeshed #18157

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Sync typeshed

Source commit:
python/typeshed@5052fa2

Note that you will need to close and re-open the PR in order to trigger CI.

mypybot and others added 4 commits November 15, 2024 00:06
This is allegedly causing large performance problems, see 13821

typeshed/8231 had zero hits on mypy_primer, so it's not the worst thing
to undo. Patching this in typeshed also feels weird, since there's a
more general soundness issue. If a typevar has a bound or constraint, we
might not want to solve it to a Literal.

If we can confirm the performance regression or fix the unsoundness
within mypy, I might pursue upstreaming this in typeshed.

(Reminder: add this to the sync_typeshed script once merged)
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

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