I have run into the same issues - in my case I can always convert a
subclass back to a superclass that is usable, but I don't see a
problem with your keyed archiver delegate returning an NSNull object
for classes it doesn't know about, or even just nil. You'll need to
experiment to see if N
I have an array of objects. The objects are all subclasses of one
parent class. (For the sake of this email, I will say that the
subclasses are all different kinds of graphics that can be displayed,
and the superclass defines generalities that all graphics have in
common.)
My concern here
