NSUserDefaults in Swift - implementing type safety

Question

One of the things that bugs me about Swift and Cocoa together is working with NSUserDefaults, because there is no type information and it is always necessary to cast the result

Answer 1

I don't mean to brag but ... oh who am I kidding, I totally do!

Preferences.set([NSData()], forKey: "MyKey1")
Preferences.get("MyKey1", type: type([NSData]))
Preferences.get("MyKey1") as [NSData]?

func crunch1(value: [NSData])
{
    println("Om nom 1!")
}

crunch1(Preferences.get("MyKey1")!)

Preferences.set(NSArray(object: NSData()), forKey: "MyKey2")
Preferences.get("MyKey2", type: type(NSArray))
Preferences.get("MyKey2") as NSArray?

func crunch2(value: NSArray)
{
    println("Om nom 2!")
}

crunch2(Preferences.get("MyKey2")!)

Preferences.set([[String:[Int]]](), forKey: "MyKey3")
Preferences.get("MyKey3", type: type([[String:[Int]]]))
Preferences.get("MyKey3") as [[String:[Int]]]?

func crunch3(value: [[String:[Int]]])
{
    println("Om nom 3!")
}

crunch3(Preferences.get("MyKey3")!)