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I'm a fan of tracking what commits a user has seen/understood. This is a bit like read receipts in a chat, right?

IIUC it also changes *what* you see (not just indicating read vs unread, or showing only unread things) The ddiffs (diffs of diffs) you see show you what changed since the last time you looked.

Yeah! Not just commits though, it tracks files too, so you can do part of a review for a commit and then come back and read the rest of the files for that commit later. If new changes are pushed in the meantime, you finish reviewing the first commit before starting over for the new one

Really interesting! We have discussed adding support generically for this to our systems