It's my understanding that Adobe has every intention of remaining a superset of EcmaScript. If ES breaks AS3 compatibility in the future, it's safe to expect th

It's my understanding that Adobe has every intention of remaining a superset of EcmaScript. If ES breaks AS3 compatibility in the future, it's safe to expect that Adobe will keep pace. FWIW, for much of its documentation, Adobe refers to the EcmaScript specification. In fact, Flash instructions map 1:1 to EcmaScript specs, including the type conversion and promotion algorithms.