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The ValueForKey and and SetValueForKey methods on NSDictionary (And NSMutableDictionary as well) only accept an NSString for the key parameter. An NSDictionary can have any NSObject as a key, not just an NSString, so you are unable to access anything using a non-NSString key.
There's an indexer that accept an NSObject instance (beside the one for string and NSString) so:
dict [new NSObject ()] = new NSObject ();
is possible today and much more nicer looking, source wise, that using `ValueForKey`.
FWIW `ValueForKey` comes from `NSObject` not `NSDictionary`.