Github user JPercivall commented on the issue:
@ToivoAdams yup, it's complaining because when you "rebase" you are
re-writing history. When you try to push it's out of sync with the branch
you're pushing to and it tells you to "pull" in order to be coordinated. By
doing a "force push", you're saying "forget whatever the current state of the
branch is, what I'm pushing is correct".
This is very nice when you're doing it to your own branch/PR but it's
pretty self-explanatory how bad it could be doing to the Apache repo.
I'm gonna take a look at the new PR now.
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