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Georges Racinet authored
This is for now mostly intended as a helper for tests. We're using one of the HGitaly tags test to make sure it works, and in turn that test gets simplified. There's a catch: `hg_git_repository.hg_tag` would not work before `subject` has been used at least once, so that the repository is indeed initialized on disk. If we were in need to use `hg_git_repository` here, we'd have to switch to `subject!` instead of just `subject`.
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