docs: function bisearch(ucs) {
      var min = 0;
      var max = COMBINING.length - 1;
      var mid;
      if (ucs < COMBINING[0][0] || ucs > COMBINING[max][1])
        return false;
      while (max >= min) {
        mid = Math.floor((min + max) / 2);
        if (ucs > COMBINING[mid][1])
          min = mid + 1;
        else if (ucs < COMBINING[mid][0])
          max = mid - 1;
        else
          return true;
      }
      return false;
    }