There are both commits in ruby-core that are not synced to this repo and vice versa.
E.g. (not an exhaustive list, only the first two commits I noticed):
- only in Ruby repo: 048f797 2019-12-22 [ruby/prime] Bump version
- only here: 55dda6a 2019-08-11 Fix Prime.include? [bug fix not shipped with 2.7.0]
(Of course, my recent commits are not expected to be synced yet.)
Where does development happen? What's the process for syncing?