public V rightValue() {
      return right;
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object instanceof MapDifference.ValueDifference) {
        MapDifference.ValueDifference<?> that = (MapDifference.ValueDifference<?>) object;
        return Objects.equal(this.left, that.leftValue())
            && Objects.equal(this.right, that.rightValue());
      }
      return false;
    }

    public V rightValue() {
      return right;
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object instanceof MapDifference.ValueDifference) {
        MapDifference.ValueDifference<?> that = (MapDifference.ValueDifference<?>) object;
        return Objects.equal(this.left, that.leftValue())
            && Objects.equal(this.right, that.rightValue());
      }
      return false;
    }