RLS: 1.4/2.0
Tracking issue for the 1.4 release. (it's possible we make this 2.0 at some point - not determined yet)

https://github.com/pandas-dev/pandas/milestone/86

Currently scheduled for December 31, 2021 (with a release candidate around 2 weeks before)

List of open regressions: https://github.com/pandas-dev/pandas/issues?q=is%3Aopen+is%3Aissue+label%3ARegression