It says "by 0 commits" when going back from detached HEAD to
master branch:
$ git checkout HEAD^
$ git checkout master
Previous HEAD position was af4c62a... Merge branch 'maint'
Switched to branch 'master'
Your branch is ahead of 'origin/master' by 0 commits.
^^^^^^^^^^^^
$ git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
^^^^^^^^^^^
#
nothing to commit (working directory clean)
--
Piotr Krukowiecki
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