symfony/symfony — comment on commit db6fea9fd014b9272627ee8c715368b7a1918741
File: src/Symfony/Component/EventDispatcher/EventDispatcher.php line 155
By schniper:

And the TraceableEventDispatcher makes good use of the eventName, for debugging purposes.
I think this is why the name was present here, too.
So I guess a rollback should be in order?