docs: function () {
        var sortKeys = arguments;
  
        return this.toArray().sort(function (a, b) {
          for (var i = 0; i < sortKeys.length; i++) {
            var key = sortKeys[i];
            var propA = _emberMetalProperty_get.get(a, key);
            var propB = _emberMetalProperty_get.get(b, key);
            // return 1 or -1 else continue to the next sortKey
            var compareValue = _emberRuntimeCompare.default(propA, propB);
  
            if (compareValue) {
              return compareValue;
            }
          }
          return 0;
        });
      }