@blake @shibao mastodon can handle it i think, but several other impls don't seem want to even consider it, which is a shame because that means you have to be aware of every single extension beforehand on the consuming side, plus on the producing side you end up having to maintain separate representations if you want to support both as2 and also generic ld. basically the issue is as2 supremacy
there's other issues with extensibility too, stuff even masto gets wrong, i'm making a list of it all