immutableEntry(Four.class, new Impl(4)),
          immutableEntry(Five.class, new Impl(5)));
    }

    @Override
    @SuppressWarnings("unchecked")
    public Entry<Class<?>, Impl>[] createArray(int length) {
      return (Entry<Class<?>, Impl>[]) new Entry<?, ?>[length];
    }

    @Override
    public Iterable<Entry<Class<?>, Impl>> order(List<Entry<Class<?>, Impl>> insertionOrder) {