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Revert sum literal integer change (python#13961)
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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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hauntsaninja authored and cdce8p committed Sep 26, 2024
1 parent 3453eca commit 3dc6544
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion mypy/typeshed/stdlib/builtins.pyi
Original file line number Diff line number Diff line change
Expand Up @@ -1654,7 +1654,7 @@ _SupportsSumNoDefaultT = TypeVar("_SupportsSumNoDefaultT", bound=_SupportsSumWit
# without creating many false-positive errors (see #7578).
# Instead, we special-case the most common examples of this: bool and literal integers.
@overload
def sum(iterable: Iterable[bool | _LiteralInteger], /, start: int = 0) -> int: ...
def sum(iterable: Iterable[bool], /, start: int = 0) -> int: ...
@overload
def sum(iterable: Iterable[_SupportsSumNoDefaultT], /) -> _SupportsSumNoDefaultT | Literal[0]: ...
@overload
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