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Objective-C already has garbage collection in OS X, but it has been deprecated as of v10.8 in favour of ARC.

http://en.wikipedia.org/wiki/Objective-C#Garbage_collection

A good point. Coming from the iOS side I missed this. I mentioned Xcode's garbage collection in passing, but pointing out that garbage collection is deprecated on OS X would've made a strong argument that ARC is the better way to do things.

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