symfony: [EventDispatcher] After upgrading to 3.3.0 removeSubscriber() does not work any more.

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	yes
RFC?	no
Symfony version	3.3.0

In some commands I use this kind of functionality to disable the sending of Emails: $this->getContainer()->get('event_dispatcher')->removeSubscriber($this->getContainer()->get('my_email_subscriber'));

And then I put it back:

$this->getContainer()->get('event_dispatcher')->addSubscriber($this->getContainer()->get('my_email_subscriber'));

After some debugging I found out that the EventDispatcher now holds closures to enhance LazyLoading in the $this->listeners array. So the array_search check does not work anymore in function removeListener.

I’m not sure if this really is a bug or if there is a new way now to achieve this.