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@evan @erincandescent @julian @mikedev @silverpill Sure, it's possible to declare both a `context` being whatever grouping, and a `thread` being specifically a reply tree. (Perhaps `thread` should be renamed to `replyTree`, and `root` should be renamed to `replyTreeRoot`?)

I'm specifically against conflating the two concepts, though. I also would prefer to not give `inReplyTo` any undue deference beyond simply being metadata. For as many systems that rely on it, there are systems that don't.