Symfony 4 Doctrine LifecycleEventArgs getEntity() vs getObject()

What is the difference between LifecycleEventArgs::getObject() and LifecycleEventArgs::getEntity()?

namespace App\EventListener;

use Doctrine\Common\EventSubscriber;
use Doctrine\ORM\Event\LifecycleEventArgs;
use Doctrine\ORM\Events;

/**
 * Class MyListener
 *
 * @package App\EventListener
 */
class MyListener implements EventSubscriber
{
    /**
     * @return array|string[]
     */
    public function getSubscribedEvents()
    {
        return [
            Events::postUpdate,
        ];
    }

    /**
     * @param LifecycleEventArgs $event
     */
    public function postUpdate(LifecycleEventArgs $event)
    {
        $entity = $event->getEntity();
        $object = $event->getObject();

        $entity === $object; //true...
    }
}

So far as I can tell these two methods return the exact same object, ie they point to the same instance of a given Entity.

Is that always the case?

Should one be used over the other or does it not matter?