Net::XMPP2 missing functionality to be RFC 3920 conform:
   - TLS: implemented, just do some extensive testing WRT blocking,
          i don't trust the current way the watchers are handled,
          i'm in fear of deadlocks...
   - SRV record lookup: weight handling!
   - make dns resolution async!
   - errorhandling for TLS and SASL!
   - testing of send_message and send_presence!
   - make extensions more optional and reentrant
   - add stanza-error objects instead error-xml nodes

Net::XMPP2::IM missing functionality to be RFC 3921 conform:
   - message and presence sending