public static Props <TMessage> Create <TActor>(Expression <Func <TActor> > fac) where TActor : Actor <TMessage> => new Props <TMessage>(Props.Create(fac));
public static TypedActorReference <TMessage> ActorOf <TMessage>(this IActorRefFactory actorReferenceFactory, Props <TMessage> props, string name) => new TypedActorReference <TMessage>(actorReferenceFactory.ActorOf(props.Underlying, name));