AS2 vocab translation coordination/funkiness

[strugee]

Heya!

I'm currently working on translating AS1 vocabulary to AS2 in pump.io in preparation for our migration to ActivityPub - I wanted to see what Granary does and try to align if possible.

Looking at https://github.com/snarfed/granary/blob/d76e923c2fb3142223668c665c3bff7f76207882/granary/as2.py I spotted a couple things that seemed funky:

• [x] AS2 has no Favorite, it uses Like in all cases instead
• [ ] Granary has Add as the AS2 equivalent of tag but these seem pretty different semantically (I assumed tag was just dropped but maybe you have a different read on the spec?)
• [ ] post isn't always equal to Create; it's an Add with a target (https://www.w3.org/TR/activitystreams-core/#activitystreams-1.0a)
• [ ] Shouldn't https://github.com/snarfed/granary/blob/d76e923c2fb3142223668c665c3bff7f76207882/granary/as2.py#L127 be @type, not type?

Let me know if I missed something. https://github.com/pump-io/pump.io/pull/1483#issuecomment-342046659 is tracking this in pump.io FWIW.

Cheers :)