Upd
When a user posts a comment (whether via Reviewable or GiHub), we automatically snapshot all revisions to ensure that the comment's context is preserved. This can lead to a mess, though, if you're taking your time pushing commits to a PR before asking for a review and a bot (perhaps CI?) is posting comments as you go. There can be dozens of snapshotted revisions by the time you invite a reviewer! 😅
To avoid this situation, Reviewable now attempts to detect whether a comment was posted by a bot and avoids snapshotting revisions in that case. We detect bots by checking whether the username ends with [bot] (for GitHub Apps bots) or -bot, or the display name ends with (bot). If you have a favorite bot account changing its username could be tricky, but it should be easy to append (bot) to its name since that oughtn't be referenced anywhere. 🥳