public function extend($name, Closure $extender) {
		$name = $this->getAlias($name);
		$component = &$this->components[$name];

		if (!isset($component['extender'])) {
			$component['extender'] = [];
		}

		if ($this->isSingleton($name)) {
			$component = $this->make($name);

			$component = $this->resolveExtend($name, $component);

			return $this->instance($name, $component);
		}

		array_push($component['extender'], $extender);
	}