code: function lastIndexOf(searchElement /* , fromIndex = @[*-1] */) {
  	    // convert -0 to +0
  	    if (NEGATIVE_ZERO$1) return $native$1.apply(this, arguments) || 0;
  	    var O = _toIobject(this);
  	    var length = _toLength(O.length);
  	    var index = length - 1;
  	    if (arguments.length > 1) index = Math.min(index, _toInteger(arguments[1]));
  	    if (index < 0) index = length + index;
  	    for (; index >= 0; index--) {
  	      if (index in O) if (O[index] === searchElement) return index || 0;
  	    }return -1;
  	  }
docs: 22.1.3.14 / 15.4.4.15 Array.prototype.lastIndexOf(searchElement [, fromIndex])