This whole thing could actually be sidestepped if we sent timestamps with our activities, but that's not in the spec, so I guess nobody does it heh.

Sounds like another suggestion that could be useful in the wiki post hehe

Tbf it feels like Mastodon could assume that the update is the latest one if there is no updated field and only use the updated fields to not apply an update, if the updated field is before the last update. Does that make sense?