docs: function(searchString) {
      // Force compiler to respect argument length.
      var argLen = arguments.length, position = arguments[1];
      var str, start, pos, len, searchLength;
      str = getCoercedStringSubject(this);
      searchString = getCoercedSearchString(searchString);
      pos = +position || 0;
      len = str.length;
      start = min(max(pos, 0), len);
      searchLength = searchString.length;
      if (searchLength + start > len) {
        return false;
      }
      if (str.substr(start, searchLength) === searchString) {
        return true;
      }
      return false;
    }