@cjwirth@maxd Ok, I can see how you can work around the lost (or obscured) history.
I'm not sure I'd want to lean on GH preserving dangling commits and resurrect the branch for everyone (it's also something you have to have permissions for - i.e. you can't bisect just any open source project for instance) but at least it's feasible.
It most certainly isn't faster than just going through the git history you already have locally, given the process. That's the power of bisect 🙂