[BUG]: Wrong return type for Phalcon\Di::getInternalEventsManager

[sergeyklay]

The current implementation of Phalcon\Di::getInternalEventsManager implies that method must return Phalcon\Events\ManagerInterface:

cphalcon/phalcon/Di.zep

Lines 268 to 271 in fc2b8d6

	public function getInternalEventsManager() -> <ManagerInterface>
	{
	return this->eventsManager;
	}

however, Phalcon\Di::$eventsManager is NULL by default:

cphalcon/phalcon/Di.zep

Lines 74 to 79 in fc2b8d6

	/**
	* Events Manager
	*
	* @var ManagerInterface
	*/
	protected eventsManager;

This leads to a fatal error:

$di = new Phalcon\Di();
$di->getInternalEventsManager();

PHP Fatal error:
Return value of Phalcon\Di::getInternalEventsManager()
must implement interface Phalcon\Events\ManagerInterface, null returned in Unknown on line 0

[sergeyklay]

Fixed in 4.0.x branch