code: function(searchString) {
      // Force compiler to respect argument length.
      var argLen = arguments.length, pos = arguments[1];
      var str = getCoercedStringSubject(this);
      searchString = getCoercedSearchString(searchString);
      return str.indexOf(searchString, pos) !== -1;
    }
docs: *
  @method includes(search, [pos] = 0)
  @returns Boolean
  @polyfill ES6
  @short Returns true if `search` is contained within the string.
  @extra Search begins at [pos], which defaults to the beginning of the
  string. Sugar enhances this method to allow matching a regex.
  
  @example
  
  'jumpy'.includes('py')      -> true
  'broken'.includes('ken', 3) -> true
  'broken'.includes('bro', 3) -> false
  
  *