Support properties with differently typed getter and setter pairs

[Azureblade3808]

Sample:

from pandas import DataFrame

df = DataFrame([[1, 2, 3]])
df.columns = ["A", "B", "C"]

columns = df.columns  # Typed as "list[str]" instead of "Index".

There are many properties in Pandas which have differently typed getter and setter pairs, like "pandas.DataFrame.columns" here. I do believe that it takes "Iterable[Any]" as the setter argument, which is even wider than the "Union[List[_str], Index[_str]]" declared in the stubs.

I don't think there is guarantee that the result of a property getter would have the same type as the value previously set to the property. Maybe the getter type can be respected?

[erictraut]

This is related to this issue, which we decided not to address at the time.

[Azureblade3808]

I see.