TYP: RangeIndex._constructor

[twoertwein]

RangeIndex._constructor returns Type[Int64Index] but it is supposed to return the current type of the class itself (Type[RangeIndex]) .

pandas/core/indexes/range.py:179: error: Return type "Type[Int64Index]" of "_constructor" incompatible with return type "Type[RangeIndex]" in supertype "Index" [override]

Found by declaring cache_readonly = property.

[twoertwein]

Very similar issue here again:
pandas/core/indexes/multi.py:1098: error: Return type "Callable[..., MultiIndex]" of "_constructor" incompatible with return type "Type[MultiIndex]" in supertype "Index" [override]

Probably need to change Index._constructor or ignore these two cases.