Swift Tuple Casting

tuple.swift

import Foundation

let string1: NSObject = NSString(string: "string1")
let string2: NSObject = NSString(string: "string2")

if let result = (string1, string2) as? (NSString, NSString)
{
    print(result)
}
else
{
    print("Failure")
}

// Prints: Failure

if let result = (string1, string2) as? (NSObject, NSObject)
{
    print(result)
}
else
{
    print("Failure")
}

// Prints: (string1, string2)