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Commit d154bd8

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hauntsaninjamypybot
hauntsaninja
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mypybot
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Revert sum literal integer change (#13961)
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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‎mypy/typeshed/stdlib/builtins.pyi

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+1-1Lines changed: 1 addition & 1 deletion
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@@ -1680,7 +1680,7 @@ _SupportsSumNoDefaultT = TypeVar("_SupportsSumNoDefaultT", bound=_SupportsSumWit
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# without creating many false-positive errors (see #7578).
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# Instead, we special-case the most common examples of this: bool and literal integers.
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@overload
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def sum(iterable: Iterable[bool | _LiteralInteger], /, start: int = 0) -> int: ...
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def sum(iterable: Iterable[bool], /, start: int = 0) -> int: ...
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@overload
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def sum(iterable: Iterable[_SupportsSumNoDefaultT], /) -> _SupportsSumNoDefaultT | Literal[0]: ...
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@overload

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