Previously, DidOther stored two strings - one for the method, one for the identifier.
This was kinda redundant, because the method is usually very short, and looking for the : separator is trivial. Everything is stored as a single String now.
This means that it basically just cuts off the common did: prefix. Maybe that's also unnecessary, and DidOther could just take over the whole String without allocating anything new. For now, though, it just stores method:ident as one String.