alt Hacker News>On Github, the unit of code review is the PR.
It is, and that is some bullshit. The only sensible way to work with that is to break up larger features into several PRs - which is often positive anyway, but sometimes it doesn't fit the nature of the change.
I am not a fan of Github's interface.
But my point is, is that I believe the important thing to preserve in history is whatever your unit of review is. If you could stack PRs and each were subject to the individual review, I would not combine and squash those (just the individual commits within each PR).