Widen dict_keys/dict_items isdisjoint parameter type

[muhamedfazalps]

Summary

Widen the parameter type of dict_keys.isdisjoint and dict_items.isdisjoint from Iterable[_KT_co]/Iterable[tuple[_KT_co, _VT_co]] to Iterable[object].

Fixes #15888

Motivation

The current strict type causes false positives when using TypedDict with closed=True where the key type is a union of string literals. When iterating over dict keys and passing them to isdisjoint, the strict type rejects valid operations:

class TD(TypedDict, closed=True):
    x: int

def check(td: TD) -> None:
    td.keys().isdisjoint(["other"])  # false positive: invalid-argument-type
    td.items().isdisjoint([("other", 1)])  # false positive: invalid-argument-type

Changes

• stdlib/_collections_abc.pyi: Changed dict_keys.isdisjoint parameter from Iterable[_KT_co] to Iterable[object]
• stdlib/_collections_abc.pyi: Changed dict_items.isdisjoint parameter from Iterable[tuple[_KT_co, _VT_co]] to Iterable[object]

This matches the pattern already used by set.isdisjoint and frozenset.isdisjoint, which accept Iterable[object].

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Discovered during open source research. https://buymeacoffee.com/muhamedfazalps

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉