How do I check if a var is a Tuple in Swift?

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Reading the Type Casting section of the Swift Guide I see I use the is keyword to type check variables.

func isString(test: AnyObject?) -> Bool {
    return test is String
}

It seems when I try something similar to check for a Tuple containing three NSNumber objects, I receive a 'Tuple does not conform to protocol AnyObject'. Is there any way to check if a variable contains a Tuple?

func isTuple(test: AnyObject?) -> {
    return test is (NSNumber, NSNumber, NSNumber) // error
}

asked 35 secs ago

atreat

1,580

How do I check if a var is a Tuple in Swift?