if (leftCode != rightCode) {
        return leftCode < rightCode ? -1 : 1;
      }

      // identityHashCode collision (rare, but not as rare as you'd think)
      int result = getUid(left).compareTo(getUid(right));
      if (result == 0) {
        throw new AssertionError(); // extremely, extremely unlikely.
      }
      return result;
    }

    @Override
    public String toString() {

      if (leftCode != rightCode) {
        return leftCode < rightCode ? -1 : 1;
      }

      // identityHashCode collision (rare, but not as rare as you'd think)
      int result = getUid(left).compareTo(getUid(right));
      if (result == 0) {
        throw new AssertionError(); // extremely, extremely unlikely.
      }
      return result;
    }

    @Override
    public String toString() {

Mitchner, Kenta Yonekura, Konrad Magnusson, Konstantin Lopuhin, @lahwran,
@lekaha, @liyongsea, Lucas Adams, @makseq, Mandeep Singh, @manipopopo, Mark
Amery, Memo Akten, Michael Heilman, Michael Peteuil, Nathan Daly, Nicolas
Fauchereau, @ninotoshi, Olav Nymoen, @panmari, @papelita1234, Pedro Lopes,
Pranav Sailesh Mani, RJ Ryan, Rob Culliton, Robert DiPietro, @ronrest, Sam