API: Change DTA/TDA add/sub to match numpy
Sits on top of #48743
@mroeschke nothing really time-sensitive here, but this is a blocker for constructor stuff Added test_addition_doesnt_downcast_reso > Added test_addition_doesnt_downcast_reso

Thanks. Just merged https://github.com/pandas-dev/pandas/pull/48743 which I release was supposed to be the Timestamp/Timedelta change.

Could you add a similar dont downcast test for DTA/TDA? test added + green Thanks @jbrockmendel 