public function expand($edges = [], $force = false)
	{
		if ($force)	foreach ($this->models as $i => $model) $this->models[$i]->expand($edges);
		else		foreach ($this->models as $i => $model) if (is_a($model, "SnooPHP\Model\Node")) $this->models[$i]->expand($edges);
		return $this;
	}