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