docs: private int indexedSearch(List<WeightBucket<T>> list, WeightBucket<T> item) {
          int i = 0;
          for (; i < list.size(); i++) {
              Comparable midVal = list.get(i);
              int cmp = midVal.compareTo(item);
              if (cmp == 0) {// item等于中间值
                  return i;
              } else if (cmp > 0) {// item比中间值小
                  return i;
              } else if (cmp < 0) {// item比中间值大
                  // next
              }
          }
  
          return i;
      }