RedBeanPHP\Facade::dup PHP Method

    public static function dup($bean, $trail = array(), $pid = FALSE, $filters = array())
    {
        self::$duplicationManager->setFilters($filters);
        return self::$duplicationManager->dup($bean, $trail, $pid);
    }

 /**
  * In the past it was not possible to export beans
  * like 'feed' (Model_Feed).
  *
  * @return void
  */
 public function testExportIssue()
 {
     R::nuke();
     $feed = R::dispense('feed');
     $feed->post = array('first', 'second');
     R::store($feed);
     $rows = R::getAll('SELECT * FROM feed');
     asrt($rows[0]['post'], '["first","second"]');
     $feed = $feed->fresh();
     asrt(is_array($feed->post), TRUE);
     asrt($feed->post[0], 'first');
     asrt($feed->post[1], 'second');
     R::store($feed);
     $rows = R::getAll('SELECT * FROM feed');
     asrt($rows[0]['post'], '["first","second"]');
     $feed = R::load('feed', $feed->id);
     $feed->post[] = 'third';
     R::store($feed);
     $rows = R::getAll('SELECT * FROM feed');
     asrt($rows[0]['post'], '["first","second","third"]');
     $feed = $feed->fresh();
     asrt(is_array($feed->post), TRUE);
     asrt($feed->post[0], 'first');
     asrt($feed->post[1], 'second');
     asrt($feed->post[2], 'third');
     //now the catch: can we use export?
     //PHP Fatal error:  Call to a member function export() on a non-object
     $feeds = R::exportAll(R::find('feed'));
     asrt(is_array($feeds), TRUE);
     $feed = reset($feeds);
     asrt($feed['post'][0], 'first');
     asrt($feed['post'][1], 'second');
     asrt($feed['post'][2], 'third');
     //can we also dup()?
     $feedOne = R::findOne('feed');
     R::store(R::dup($feedOne));
     asrt(R::count('feed'), 2);
     //can we delete?
     R::trash($feedOne);
     asrt(R::count('feed'), 1);
     $feedTwo = R::findOne('feed');
     $feed = $feedTwo->export();
     asrt($feed['post'][0], 'first');
     asrt($feed['post'][1], 'second');
     asrt($feed['post'][2], 'third');
 }