@theducks - Re your "oddity" test case - that should get found when you run the duplicate series check though right? The way the check works currently there is an "assumption" in this check that you have eliminated your duplicates first.
As for your [123] case - well that is a perfect example of the limitations of this sort of check, absolutely nothing I can do about it I can think of. Serves you right for getting "funky" with your omnibus
