docs: public static int nextClearBit(long v, int start) {
      if(start >= Long.SIZE) {
        return -1;
      }
      start = start < 0 ? 0 : start;
      long cur = ~v & (LONG_ALL_BITS << start);
      return cur == 0 ? -1 : Long.numberOfTrailingZeros(cur);
    }