XEPs current supported are in src/XMPPThread, at the IQ disco advertising.

Somewhat implemented XEPs:
    ~ https://xmpp.org/extensions/xep-0085.html
        Only XMPP->Matrix at the moment. Still need to figure out how to 
        get typing indicators as an AS.
    ~ https://xmpp.org/extensions/xep-0444.html
        This allows reactions, which Matrix also has support to. The two 
        systems don't seem *too* restrictive on one-another (unlike some 
        IM platforms I won't mention), so this doesn't sound too bad to do
                HALF-IMPLEMENTED: Removing reacts won't work.
    ~ https://xmpp.org/extensions/xep-0184.html
        Only Matrix->XMPP as of now. Requesting data from Matrix ASes without 
        /sync seems like a non-option as of now, which _sucks_.
    ~ https://xmpp.org/extensions/xep-0050.html
        Ad-hoc commands that bridge maintainers can deal with XMPP-style are 
        also a nice to have.
        There are commands, but not a lot of them as of now, and localisation 
        is missing.
    ~ https://xmpp.org/extensions/xep-0421.html
        Using the occupant ID in semi-anonymous MUCs is a desirable property.
        I dont know of a lot of places that don't use the occupant ID anymore 
        within Parsee.
    ~ https://xmpp.org/extensions/xep-0425.html
        As mentionned in #2, moderation _needs_ to be done.

For future XEPs:
    - https://xmpp.org/extensions/xep-0449.html
        Stickers are great. Matrix and XMPP somewhat has support for them, so
        might be a nice-to-have, and also to push over XMPP support.
        A minor issue with that is pack management. XMPP requires a pack field 
        which is used along PEP, it seems, and meanwhile Matrix has ''support''
        for packs too, tracking them is between "annoyance" and "yeah, no.".

ON STANDBY BECAUSE THESE HAVE BEEN TERRIBLE TO DEAL WITH AND WHO KEEPS WRITING
THESE I WANT TO SEND THEM A NICE, BRIGHT GIFT:
    x https://xmpp.org/extensions/xep-0084.html
        Avatar support would be extremely useful, if just a QoL improvment.
        Matrix and XMPP both have support for these.
        XEP-0084 is a pain in the ass to implement and seems generally just
        unreliable, however.
    x https://xmpp.org/extensions/xep-0080.html
        Can't think of a good analogy to these...


Not XEPs, but ideas that _needs_ to be added:
    v "also it [Bifrost] doesn't respect voice either" -> Send a form on moderated 
      MUCs (which is standard, so its not too bad!). Currently WIP, and barely tested.
    ~ "GIVE THE PUPPETS APPROPRIATE PLS/ROLES" - Hydro/t4d
    - Standalone/Static Parsee, ideally as small as it can be(if not as APE).
    - Kappa-like extension system(maybe bridging more than just Matrix-XMPP.)
    - https://www.youtube.com/watch?v=InL414iDZmY


------------------------- MSC LAND -------------------------
- MSC2346: Bridged metadata is useful, at least for other bridges.
- https://spec.matrix.org/v1.11/client-server-api/#third-party-lookups is _very_ 
useful on the Matrix side, to be frank.