docs: function reduceRight(O, _fn) {
              var i = O.length - 1,
                  tokenItem = O[i];
              for (; i > 0;) {
                  if (typeof O[i] != "undefined") {
                      if ((tokenItem = _fn.call(root, tokenItem, O[--i])) === false) break;
                  }
              }
              return tokenItem;
          }