}

  private <T> @Nullable T defaultGenerate(Class<T> rawType) {
    if (rawType.isInterface()) {
      // always create a new proxy
      return newProxy(rawType);
    }
    return ArbitraryInstances.get(rawType);
  }

  private <T> T newProxy(final Class<T> interfaceType) {
    return Reflection.newProxy(interfaceType, new FreshInvocationHandler(interfaceType));
  }