> I first would question what a user wants to do with a hashmap that uses polymorphic key-values of unknowable type at compile-time. All of Apple's modern plat

> I first would question what a user wants to do with a hashmap that uses polymorphic key-values of unknowable type at compile-time. All of Apple's modern platforms use this concept pervasively, because the Objective-C Foundation framework has a common primitive data structure for it (NSDictionary).