This is one of those things that sounds obvious in retrospect:
AnyObject is Swift's way of saying, "I don't mind what type of object you pass in here, it could be a string, it could be a string, it could be a number, it could be an array, or it could be a custom type you defined yourself.
If you were wondering: the reason numbers work even though they clearly aren't objects is because Swift silently makes them objects when they need to conform to
Available from iOS 7.0
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