code: function keysMatch(keyOrListA, keyOrListB) {
  		var a, b;
  		if (keyOrListA === keyOrListB) {
  			return true;
  		}
  		a = [].concat(toArray(keyOrListA)).sort();
  		b = [].concat(toArray(keyOrListB)).sort();
  		return a + '' === b + '';
  	}
docs: Determine whether two keys (or sets of keys) are equivalent.