Emily Shaffer [off-list ref] writes:
quoted hunk
@@ -175,6 +183,8 @@ invoked after a commit is made.
This hook is meant primarily for notification, and cannot affect
the outcome of `git commit`.
+Hooks executed during 'post-commit' will run in parallel by default.
The "by default" makes it sound as if there is a way to force
'post-commit' alone serially, but other than hook.jobs that can be
used to uniformly make everything run serially, I didn't find a way
to do so.
The comment applies to all the "by default" in this latter half of
the series.
Thanks.