Actually, `jj git push` will only push named branches, which are now called "bookmarks". You simply don't attach a bookmark to @, and `jj git push` will NEVER

Actually, `jj git push` will only push named branches, which are now called "bookmarks". You simply don't attach a bookmark to @, and `jj git push` will NEVER push it (to what branch would it push?) The branch you're working on is instead on @-. So when you squash, it updates the branch.