docs: public static double enlargement(SpatialComparable exist, SpatialComparable addit) {
      final int dim = assertSameDimensionality(exist, addit);
      double v1 = 1.;
      double v2 = 1.;
      for(int i = 0; i < dim; i++) {
        final double emin = exist.getMin(i);
        final double emax = exist.getMax(i);
        final double amin = addit.getMin(i);
        final double amax = addit.getMax(i);
  
        final double min = Math.min(emin, amin);
        final double max = Math.max(emax, amax);
        v1 *= (max - min);
        v2 *= (emax - emin);
      }
      return v2 - v1;
    }