Returns a key-value es6 compliant iterator.
@method sjl.stdlib.ObjectIterator#entries
@overrides sjl.stdlib.SjlMap#entries
@returns {sjl.stdlib.ObjectIterator}
function () {
            return this.sort().wrapItems ?
                new ObjectIterator(this._keys, this._values.map(function (item) {
                    return item.value;
                })) :
                new SjlMap.prototype.entries.call(this.sort());
        }