for all following revision specifiers, up to the next `--not`.
--all::
- Pretend as if all the refs in `refs/` are listed on the
- command line as '<commit>'.
+ Pretend as if all the refs in `refs/`, along with `HEAD`, are
+ listed on the command line as '<commit>'.
--branches[=<pattern>]::
Pretend as if all the refs in `refs/heads` are listed