GH1222 PR feedback

Author: loicdiridollou

pandas-stubs/_typing.pyi

@@ -514,6 +514,7 @@ IndexKeyFunc: TypeAlias = Callable[[Index], Index | AnyArrayLike] | None
 
 # types of `func` kwarg for DataFrame.aggregate and Series.aggregate
 # More specific than what is in pandas
+# following Union is here to make it ty compliant https://github.com/astral-sh/ty/issues/591
 AggFuncTypeBase: TypeAlias = Union[Callable, str, np.ufunc]  # noqa: UP007
 AggFuncTypeDictSeries: TypeAlias = Mapping[HashableT, AggFuncTypeBase]
 AggFuncTypeDictFrame: TypeAlias = Mapping[