They order does not matter and can be arbitrary. But when you compare two entries you need to sort them, because the entries are arrays. It's like the trick of

They order does not matter and can be arbitrary. But when you compare two entries you need to sort them, because the entries are arrays. It's like the trick of converting sttings to lower-case to get an case-insensitive comparison (which is a bad idea in a non-Latin world, but that's another story).