Sync typeshed for 1.6 #15918
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Sync typeshed for 1.6 #15918
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Source commit: python/typeshed@6a8d653
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)
Since the plugin provides superior type checking: python#13987 (comment) A manual cherry-pick of e437cdf.
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Diff from mypy_primer, showing the effect of this PR on open source code: steam.py (https://github.com/Gobot1234/steam.py)
- note:/old_mypy/venv/lib/python3.10/site-packages/mypy/typeshed/stdlib/builtins.pyi:100: note: "__new__" of "object" defined here
+ note:/new_mypy/venv/lib/python3.10/site-packages/mypy/typeshed/stdlib/builtins.pyi:100: note: "__new__" of "object" defined here
- note:/old_mypy/venv/lib/python3.10/site-packages/mypy/typeshed/stdlib/builtins.pyi:100: note: "__new__" of "object" defined here
+ note:/new_mypy/venv/lib/python3.10/site-packages/mypy/typeshed/stdlib/builtins.pyi:100: note: "__new__" of "object" defined here
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Use the sync-typeshed script to sync the latest typeshed before the 1.6 release.