code: function (pos) {
                  if (this._choice) {
                      if (undefined === pos) {
                          pos = this._items.length - 1;
                      }
                      return this._items[pos];
                  }
                  return this._items;
              }
docs: Get the current list of items
  
  @param {Number} [pos=undefined] When choices, get the items
  at the given position (last one when undefined). Ignored
  otherwise.
  @return {PatternItem[]}
  @private