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Interesting! We're definitely thinking about making it a bit easier to see the commit history of a PR - we use the atomic unit of "versions" for updates to a PR, and reviews are often left on the most up-to-date version. But yeah I see what you're getting at here

+1, my team mates come from a culture of having well formed individual commits, which is philosophically aligned with stacked diffs, but the lack of this feature means they feel like they have to go back to github to follow their style of code review.