docs: function indexOf(array, value, fromIndex) {
      var index = toInteger(fromIndex),
          length = (array = Object(array)).length >>> 0;
  
      index = (index < 0 ? max(0, length + index) : index) - 1;
      while (++index < length) {
        if (index in array && value === array[index]) {
          return index;
        }
      }
      return -1;
    }