Eventbus question: When to call HandlerRegistration.removeHandler() ?

hi,

I have a question to eventbus handling:
when do I have to  remove handlers from the eventbus via HandlerRegistration.removeHandler() ?
In our application an activity is a presenter as well.
The docs of Activity say:

/**
    * Called when the Activity's widget has been removed from view. All event
    * handlers it registered will have been removed before this method is called.
    */
   void onStop();

 /**
    * Called when the Activity should ready its widget for the user.
    * ...
    * <p>
    * Any handlers attached to the provided event bus will be de-registered when
    * the activity is stopped, so activities will rarely need to hold on to the
    * {@link com.google.gwt.event.shared.HandlerRegistration HandlerRegistration}
    * instances returned by {@link EventBus#addHandler}.
    * ...
    */
   void start(AcceptsOneWidget panel, EventBus eventBus);

So, does this mean, I don't have to care about unregistering handlers within my presenter/activity because this is done automatically?
Consecutive starts of an activity/presenter that will register handlers in their start-method will NOT cause duplicate registrations of the same handler ?

I browsed the GWT sources (2.5.1) but didn't find a concluding answer to this.

TIA
Kibu

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