So, given a collection, how do you identify if an element is an instance of NSNull? You do what is essentially a type-check. To me, this negates the purpose of

So, given a collection, how do you identify if an element is an instance of NSNull? You do what is essentially a type-check. To me, this negates the purpose of the message-eating nil. Not everywhere, as you seems to be reading, but where NSNull is used, which well, actually, can be anywhere, since we use lots of collections.