Whenever you force push v2, v3, v4 of your branch called "foobar", you can also push branches called "foobar-v2", "foobar-v3", "foobar-v4" (pointing to identical commit hashes, respectively). The "foobar" branch is what refreshes the PR. There are no PRs for the versioned (and effectively read-only) branches, they are there for reviewer reference.
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