[mikepurvis]

Yeah, you're reliant on Github metadata to make those links for you; there's nothing natively in git itself doing it. It's also an all-or-nothing affair, where the whole PR becomes a single squashed commit. To get anything in between ("here's my single large PR which I've rebased into N incremental commits, but you can also dig in and see the work that actually led here"), you really do need first class support in the tool.

I suppose the Github answer to all this would be "just make separate PRs", but going that way asks a lot more of the developer in terms of how polished those incremental states need to be.