Yes, that's why I asked it as a response to them saying GitHub was just fine :) With Git, I work around it by adding `--fixup` commits and then doing a final `git rebase --autosquash` just before landing it, but it would be nice to have a better workflow.

(The mention of the GitHub SVP being interested in stacked diffs sounds good in that regard. I'm also keeping an eye on Tangled and, now, on ERSC.)