FIX: add nbytes property in Categorical
Merge pull request #8414 from JanSchulz/nbytes_categories

FIX: add nbytes property in Categorical
BUG: Bug in interesection of non-monotonic non-unique indexes (GH8362)
API/BUG: a  timeseries/index localized to UTC when inserted into a Series/DataFrame will preserve the UTC timezone (rather than being a naive datetime64[ns]) as object dtype (GH8411)