Update comments for operator.itemgetter.__call__ generic following mypy 1.11 fix (#13489)

stdlib/@tests/test_cases/check_SupportsGetItem.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from _typeshed import SupportsDunderGT, SupportsDunderLT, SupportsGetItem
+from collections.abc import Callable
+from operator import itemgetter
+from typing import Any, TypeVar
+from typing_extensions import assert_type
+
+_T = TypeVar("_T")
+
+
+# This should be equivalent to itemgetter().__call__
+def standalone_call(obj: SupportsGetItem[Any, _T]) -> _T: ...
+
+
+# Expected type of itemgetter(1).__call__
+expected_type_itemgetter_call: Callable[[SupportsGetItem[int, _T]], _T]  # pyright: ignore[reportGeneralTypeIssues]
+
+# Expecting itemgetter(1) to be assignable to this
+# based on the example below: min({"first": 1, "second": 2}.items(), key=itemgetter(1))
+# That example and assigning to this variable are what failed in https://github.com/python/mypy/issues/14032
+expected_assignable_to: Callable[[tuple[str, int]], SupportsDunderLT[Any] | SupportsDunderGT[Any]]
+
+
+# Regression tests for https://github.com/python/mypy/issues/14032
+# assert_type(itemgetter("first")({"first": 1, "second": 2}), int) # See comment on itemgetter.__call__
+assert_type(min({"first": 1, "second": 2}, key=itemgetter(1)), str)
+assert_type(min({"first": 1, "second": 2}.items(), key=itemgetter(1)), tuple[str, int])
+assert_type(standalone_call({"first": 1, "second": 2}), int)
+assert_type(min({"first": 1, "second": 2}, key=standalone_call), str)
+assert_type(min({"first": 1, "second": 2}.items(), key=standalone_call), tuple[str, int])
+
+expected_itemgetter_call_type = itemgetter(1).__call__
+expected_itemgetter_call_type = itemgetter(1)
+expected_assignable_to = itemgetter(1)
+
+expected_itemgetter_call_type = standalone_call
+expected_assignable_to = standalone_call