David, welcome to the forums!
This is a bug which was reported last week here http://community.jboss.org/thread/160976?tstart=30. It will be fixed soon (and will be available in 6.0.1 of JBoss AS). I'm just waiting for a JIRA project to be setup so that it can be tracked accordingly.
Thanks, Jaikiran, I just discovered that other thread myself. I hope this can be fixed soon, it has a serious impact on Scala applications. Weld, though, handles this case correctly.