[hibernate-dev] 3.5.0-Beta-3 has different behaviour on commit as 3.5.0-Beta-2, is this intended?

[Guenther Demetz]

-until 3.5.0-Beta-2 a ConstraintViolationException during commit caused 
an implicite rollback and the exception was wrapped into a 
javax.persistence.RollbackException
-now with 3.5.0-Beta-3 the same ConstraintViolationException during 
commit is wrapped into a javax.persistence.PersistenceException without 
implicite rollback

Is this a wanted behavior change?
If yes, where it is documented?

best regards
G.D.