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If you push a branch with many commits, does it run CI on each commit? In sequence or with some parallelism?

It runs on the last commit with the idea that it will all be squashed at merge. Are you worried about reverting some commits but not all?
That depends on the forge and the configuration of the forge. See the parent of the comment you replied to. Not everyone uses squash merge.
That's the normal setup, but the parent comment made it sound like theirs would build every commit?

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