I don't agree with the premise. There's option 4, start off a new branch for the new feature, make that a new PR. That solves most problems, you can push that n

I don't agree with the premise. There's option 4, start off a new branch for the new feature, make that a new PR. That solves most problems, you can push that new PR for review as soon as your earlier PR is merged in which will allow you to rebase on master.