@ticho @julian An important thing to remember with AP is that the AP protocol itself is pretty loose. Mastodon is one particular implementation of it, and doesn't even absolutely comply with the spec. Hence why some of the other server softwares have more features or slight incompatibility with Mastodon. So I'd be more inclined to believe that the oddities of conversation threading are in the Mastodon implementation rather than the AP spec itself.
Yes, some pendantry, but it means fixing it is down to one development team, not all Fediverse implementations.

