Mark Levedahl [off-list ref] writes:
This change allows, for instance
git branch -d refs/heads/foo
to succeed. Without this patch, the code just assumes that the
given branch name should be appended to "refs/heads" or
"refs/remotes", thus attempting (and failing) in the above case
to delete "refs/heads/refs/heads/foo"
Your logic is broken.
Why doesn't the user simply say "git branch -d foo"? The command takes
"the branch name", not "arbitrary ref name".