Great to know about these. I still think the current default is better: for a new user, it might be scary for your uncommitted changes to "vanish" into a stash.
The stash is popped before the command finishes, so your changes don't appear to vanish. Unless there's a conflict while rebasing a prior commit. Actually I'm not sure if aborting the rebase at that point would pop the autostash, but it should.
