docs: public static double relativeOverlap(SpatialComparable box1, SpatialComparable box2) {
      final int dim = assertSameDimensionality(box1, box2);
  
      // the overlap volume
      double overlap = 1.;
      double vol1 = 1.;
      double vol2 = 1.;
  
      for(int i = 0; i < dim; i++) {
        final double box1min = box1.getMin(i);
        final double box1max = box1.getMax(i);
        final double box2min = box2.getMin(i);
        final double box2max = box2.getMax(i);
  
        final double omax = Math.min(box1max, box2max);
        final double omin = Math.max(box1min, box2min);
  
        // if omax <= omin in any dimension, the overlap box has a volume of zero
        if(omax <= omin) {
          return 0.;
        }
  
        overlap *= omax - omin;
        vol1 *= box1max - box1min;
        vol2 *= box2max - box2min;
      }
  
      return overlap / (vol1 + vol2);
    }