I've also noticed that if the collaborative artist is first, the sorting will also be numerical.

For example: I have a record credited to 4 Motion vs 12" Thumpers. I've just split the artist using the new collaboration function. The record is now sorted numericaly by the first artist (in this case 4 Motion). I've tried it with a few different numbers, and anything before 12, is now sorted before 12" thumpers, any number after 12 is sorted after 12" thumpers.

There is also an additional sort depending on the position of the sort artist (again sorted alphanumericaly).

Does this make sense??

David