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Georges Racinet authored
The `hg_changeset_branch` and `hg_changeset_branch_topic` methods are called on exact full hexadecimal SHAs only. Our general convention in that case (already in use in HGitaly) is that such reader methods should just work, because it just means that the application stored the hash in one way or another, and that accepting obsolete changesets does not bring any ambiguity. Closes #487
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