cyrus 2.2 virtual domains and mailbox delete

[Ilya]

I just tried to delete a top level (user.username at domain.com) from both cyradmin
and php imap_deletemailbox. The delete works, but subfolders for that user are
not deleted. 
If however I create a user in defaultdomain (user.username) than whenever I
delete the user everything is gone under him as well.
I believe it is the behaviour of 2.1.1x as well.

Ken, are the subfolders left on purpose, or its and error?