And to add to the discussion thread the api for NSArray says:
Conformance to the NSKeyValueCodingAdditions interface. NSArray's implementation is more complex than the default:
* If keyPath indicates an operation takes an argument (such as computing an average), valueForKeyPath performs the operation and returns the result. key indicates an aggregate operation if its first character is "@". For example, if key is "@avg.salary", valueForKey invokes compute on the "avg" operator specifying the array and "salary" as arguments. This has the effect of computing and returning the average salary of the array's elements. * Otherwise, valueForKeyPath behaves similarly to valueForKey and produces a new NSArray whose elements correspond to the results of invoking valueForKeyPath on each element of this array.
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