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@strypey
I'd like to have diff-aware collections that you could send the last timestamp to and it gets you everything that has changed since then, but no such mechanism in AP and it would be pretty hard to do. Doing per-post update denouncing has worked fine so far, though imo collections of replies should get serialized as plain collections of URLs so it's much cheaper to paginate them, and then the posts could be fetched in a second step