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Encourage developers to use as few or as many commits as they choose in their PRs, with the intent to most clearly communicate the reviewable progress reviewable progress of their work during PR review and for posterity. This means rebasing locally, adding/removing commits, and force-pushing are all still allowed, although these should be used only as only as necessary/helpful (e.g. when a new commit on on develop assists the PR or to correct noise/mistakes). If force-push is used, communicate it thoughtfully.
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