> Why NSConcreteData? Does it create a different object under 
> the hood

Yes, NSData is a class cluster (see Google).  NSString, NSArray 
and NSDictionary are too, and no doubt others.  But I don't see 
why you shouldn't put a category on NSConcreteData, other than 
the fact that the sand might shift under your feet in a future 
release of the OS.

Paul Sanders. 



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