Index(SparseArray([int])) has object type

[TomAugspurger]

In [2]: pd.Index(pd.SparseArray([1, 2]))
Out[2]: Index([1, 2], dtype='object')

Should this be an Int64Index?

[TomAugspurger]

This also affects IntegerArray

In [9]: pd.Index(pd.array([1, 2], dtype='Int64'))
Out[9]: Index([1, 2], dtype='object')

in that case, object-dtype may be more appropriate since NumPy can't represent nullable int64 data.

[jbrockmendel]

closed by #49307