docs: public LocationIndexTree setMaxRegionSearch(int numTiles) {
          if (numTiles < 1)
              throw new IllegalArgumentException("Region of location index must be at least 1 but was " + numTiles);
  
          // see #232
          if (numTiles % 2 == 1)
              numTiles++;
  
          this.maxRegionSearch = numTiles;
          return this;
      }