On Sep 21, 2016, at 17:01 , Graham Cox <graham....@bigpond.com> wrote:
> This should be: if([(NSString*)context 
> isEqualToString:@“mediaLibraryLoaded”])…

Actually, this is not a good idea either, because *other* observations — ones 
you don’t control — might use a value that’s not an object, or not even a valid 

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