I'm using [`NSJSONSerialization JSONObjectWithData:options:error:`](http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html#//apple_ref/occ/clm/NSJSONSerialization/JSONObjectWithData%3aoptions%3aerror%3a) in an iOS 5 project to read a JSON string and convert it to a Foundation object. Is there an easy way to find out if the object or some of its children are arrays, dictionaries, numbers or strings?