Sure, but the answer is you just make an arbitrary decision that feels right. Same thing with name ordering and the other issues you mention. There isn't much

Sure, but the answer is you just make an arbitrary decision that feels right. Same thing with name ordering and the other issues you mention. There isn't much benefit to coming up with some elaborate system of rules for these things -- after all, the goal is to create a categorization that is easy for you to find things with, not to generate the timeless perfect metadata which all humans agree is correct.