dynamicToStaticType.dart

class Identifiable<T> {
  Id<T> id;
}

class Id<T> {}

class Person extends Identifiable<Person> {}

class Animal extends Identifiable<Animal> {}

class Resolver<T extends Identifiable> {
  void resolve(dynamic arg, void Function<V extends Identifiable>(dynamic) func) {
    func<T>(arg);
  }
}

final dynamic resolvers = {
  Id<Person>().runtimeType: Resolver<Person>(),
  Id<Animal>().runtimeType: Resolver<Animal>()
};

void reveal<T extends Identifiable>(Id<T> id) {
  print("Static: ${Id<T>().runtimeType}");
  print("Dynamic: ${id.runtimeType}\n");
}

void resolve(dynamic arg, void Function<V extends Identifiable>(dynamic) func) {
  resolvers[arg.runtimeType].resolve(arg, func);
}

main() {
  dynamic lst = [];
  
  lst.add(Id<Person>());
  lst.add(Id<Animal>());
  
  /*
    Static: Id<Identifiable<dynamic>>
    Dynamic: Id<Person>
  */
  reveal(lst[0]);

  /*
    Static: Id<Person>
    Dynamic: Id<Person>
  */
  resolve(lst[0], <V extends Identifiable>(arg){
    reveal<V>(arg);
  });
}