JID case sensitivity

[Alex Vandiver]

Heya,
  While looking at the roster created in
DJabberd::RosterStorage::SQLite, I noticed that JIDs appeared more than
once, with differing case.  Additionally, case canonicalization doesn't
look like it's done anywhere in DJabberd::JID.  The RFC implies that
resource identifiers are case-sensitive, but node identifiers and
hostnames are _not_.  Am I misreading the spec, or is there a notable
bug here?
 - Alex