@Override
                  @SuppressWarnings({"unchecked", "rawtypes"})
                  public Map<Class<?>, Impl> create(Object... elements) {
                    MutableClassToInstanceMap<Impl> map = MutableClassToInstanceMap.create();
                    for (Object object : elements) {
                      Entry<?, ?> entry = (Entry<?, ?>) object;

          return Integer.compare(left.getParameters().size(), right.getParameters().size());
        }
      };

  private final MutableClassToInstanceMap<Object> defaultValues =
      MutableClassToInstanceMap.create();
  private final ListMultimap<Class<?>, Object> distinctValues = ArrayListMultimap.create();
  private final NullPointerTester nullPointerTester = new NullPointerTester();