#Smithereen update. I've completely rewritten the way user avatars are stored, both remote and local. I now cache the ones for remote users, and store them in 4 sizes and in jpeg and webp. This was a lot of work, and I now need to do the same for post photos. As an added benefit, "icon" in AP is no longer an array – some software didn't like that.
As I found out yesterday, I've also forgotten that I need to send Delete activities when deleting posts. Now I do send them.
And also, what kind of activity am I supposed to look for to know when someone's avatar was updated?