[Concurrency] Actors & actor isolation

The Store in my example is an actor class so I don’t understand the question. Can you elaborate?

Another example from my library is:

final actor class TupleStore2<Store0: GlobalActor, Store1: GlobalActor>: GlobalActor
  where Store0.ActorContext == Store1.ActorContext
    typealias ActorContext = Store0.ActorContext

In my library TupleStore2 is actually a struct. Ideally a heap allocation could be avoided but I'm not sure how that could be expressed in terms of the current pitch.