REF/TYP: Rename ABCIndexClass->ABCIndex and use cast#38329

Merged

jreback merged 4 commits intopandas-dev:masterfrom

rhshadrach:abcindex

Dec 12, 2020

Commits on Dec 6, 2020

REF/TYP: Rename ABCIndexClass->ABCIndex and use cast
rhshadrach
committed

Commits on Dec 7, 2020

Removed ndarray from cast
rhshadrach
committed

Commits on Dec 12, 2020