I want to observe a key on objects residing in a collection (NSSet
preferably but maybe an NSArray would work too). So, lets say I
have a collection of 10 objects, each having a key "enabled", and I
want to observe the value of the key "enabled" for each object, and
also track new objects coming and going from the collection. (I
want to do this because I want to maintain a separate collection of
enabled objects, and I want to it always be up to date)
[...]
How would you do it?
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