XEP-0100 specifies that gateways to a non-XMPP protocol SHOULD represent non-XMPP users as bare JIDs unless the non-XMPP protocol also has an equivalent of resources. However, the current Gabble codebase assumes that bytestreams (file transfers, Tubes) can't be made to (or by) users who've given us a bare-JID-only presence.
This is unlikely to be a problem in practice, since a gateway supporting bytestreams seems unlikely, but it would be nice to get this right.
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