Question about setView()

I'm wondering if the wording of setView() is not a bit short? The draft
doesn't say anything about invalid rectangles being passed in for
example.
 
Should more feedback be sent to the user? Currently, the function
prototype has a void return type. Should we change that to a boolean or
something else? or throw an exception perhaps.
 
I also question the possibility of a major scale change, ex: scaling in
by a factor of 100 (and loosing sight of the overall picture). Should
the user be told that such a change occurred?
 
Thoughts?
Benoit.