@Override
    public int hashCode() {
        return subscriber.hashCode() + subscriberMethod.methodString.hashCode();
    }
Becomes false as soon as {@link EventBus#unregister(Object)} is called, which is checked by queued event delivery
{@link EventBus#invokeSubscriber(PendingPost)} to prevent race conditions.
EventBus/src/org/greenrobot/eventbus/Subscription.java