docs: protected void integrityCheckParameters(N parent, int index) {
      // test if mbr is correctly set
      E entry = parent.getEntry(index);
      HyperBoundingBox mbr = computeMBR();
  
      if(/* entry.getMBR() == null && */mbr == null) {
        return;
      }
      if(!SpatialUtil.equals(entry, mbr)) {
        String soll = mbr.toString();
        String ist = new HyperBoundingBox(entry).toString();
        throw new RuntimeException("Wrong MBR in node " + parent.getPageID() + " at index " + index + " (child " + entry + ")" + "\nsoll: " + soll + ",\n ist: " + ist);
      }
    }