Orphan comments

Does Optimize DB also take care of orphan comments?
With orphan comments I mean comments, which still exist in the DB although their parent has been deleted. E.g. comments which belong to a post or page, but the corresponding post or page is gone. Or (even more important for me) comments belonging to a deeply nested comment structure, where the first comment has been deleted.
Are those orphan comments removed during an Optimize DB run?
If not: Could that be done in a future version? Please. 🙂