Returns the next iterator result for item at own `pointer`'s current position.
@method sjl.stdlib.PriorityList#next
@overrides sjl.stdlib.Iterator#next
@returns {{done: boolean, value: *}|{done: boolean}} - Returns `value` key in result only while `done` is `false`.
function () {
            var next = Iterator.prototype.next.call(this);
            if (!next.done && this.wrapItems) {
                next.value = next.value.value;
            }
            return next;
        }