ensure _source_branch is never a tag #27
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If you're releasing to the CPAN where your HEAD is also tagged,
_source_branch's default would populate the attribute with the tag name. This
is sub-optimal, and tends to result in things like:
The fix is to constrain the set of refs name-rev uses to name a commit
to the set of branches.
...why would we ever do this? Well, imagine a situation where a TRIAL/dev
release has been cut and deemed satisfactory; it's possible a release would be
cut directly, without any changes from the previous release.