code: void select(OptMapInfo alt) {
          if (alt.value == 0) return;
          if (value == 0) {
              copy(alt);
              return;
          }
  
          int v1 = z / value;
          int v2 = z /alt.value;
  
          if (mmd.compareDistanceValue(alt.mmd, v1, v2) > 0) copy(alt);
      }
docs: /* 32768: something big value