> Also, the fact that most of or beans extend AutoCloseable makes CDI lifecycle a bit confusing: should users add a @PreDestory method? Should they simply add code to #close()? Both?

DECISION: let's just improve the Javadoc to 1) tell in which order the close() / @PreDestroy-annotated methods will be called and 2) remind users that their close() methods should work correctly even if called twice.