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Sync typeshed - #21852

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JelleZijlstra merged 11 commits into
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mypybot/sync-typeshed
Aug 15, 2026
Merged

Sync typeshed#21852
JelleZijlstra merged 11 commits into
masterfrom
mypybot/sync-typeshed

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Sync typeshed

Source commit:
python/typeshed@6fba3ae

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

mypybot and others added 11 commits August 15, 2026 00:05
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)
The plugin provides superior type checking:
#13987 (comment)
A manual cherry-pick of e437cdf.
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

@JelleZijlstra
JelleZijlstra merged commit 8f3f594 into master Aug 15, 2026
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@JelleZijlstra
JelleZijlstra deleted the mypybot/sync-typeshed branch August 15, 2026 01:32
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5 participants