Jeff King [off-list ref] writes:
By the way, I noticed something funny that I forgot to mention:
git log --tags=does-not-exist
shows HEAD, because the logic to kick in the default only asks "were we
given any refs to start the traversal?". I think it probably should
consider a wildcard with no matches to override the default, and show
nothing.
I haven't decided if it should be empty-but-success, or give an error.
I agree. The same for --branches, --glob, etc. I'd say it should
behave just like "git log HEAD..HEAD".