NSOrderedSet should support KVC collection operators

Originator:nicolas.bouilleaud
Number:rdar://12741645 Date Originated:2012/11/22
Status:Open Resolved:
Product:Mac OS X SDK Product Version:10.8
Classification:Serious Bug Reproducible:Always
 
NSOrderedSet does not support KVO collection operators, such as @distinctUnionOfArrays. 

Calling
 -[NSOrderedSet valueForKeyPath:@"@distinctUnionOfArrays.<keypath>"].
throws an exception.

Some sample code illustrating the issue is available here :

https://gist.github.com/4131671

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