Yup, you usually fork the engine at some 8-12 months out from ship with the intention of never merging back(or very little) to mainline. I remember when we'd t

Yup, you usually fork the engine at some 8-12 months out from ship with the intention of never merging back(or very little) to mainline. I remember when we'd take UE3 drops, it's take one engineer a whole month of compiler errors + fixing stuff to get it back to where we started with.