Bear in mind that they did say that they’d “over refactored” as part of their process–let’s see what the code looks like when it’s done.
[edit] On this forum, we often have bears in mind. 
[edit 2] Ah, regarding my confusion above about a changelog that mentions CollisionHandlerPusher, I’ve just noticed that said changelog is not part of the new changes, and is in fact much older. I still find it curious that there’s indication that the collision-approach was changed while the code seems to indicate otherwise, but that’s not relevant to this new set of changes. My apologies!