How to Represent Dictionary as NSValue in Swift 3?

I have the following Dictionary:

let example: [String: (Int, Int)] = ["test": (0, 1)]

I need to store this as an NSData variable, and to do that it must first be converted to an NSValue, which I try to do as follows:

let nsval = NSValue().getValue(example as! UnsafeMutableRawPointer)

Only to be met with the error:

Cannot convert value of type 'Void' (aka '()') to specified type 'NSValue'

I've seen SO answers that suggest using:

let test = UnsafeMutablePointer.load(example)

But that also yields the error:

Type 'UnsafeMutablePointer<_>' has no member 'load'

So then, how is one to convert a dictionary to an NSValue in Swift 3?

In theory, if you really want to turn a swift Tuple into a data object, you could do this.

var x:(Int, Int) = (4, 2)

var bytes:Data = withUnsafeBytes(of: &x){ g in
    var d = Data()
    for x in g {
        d.append(x)
    }

    return d
}

heres the reverse:

var y:(Int, Int) = (0,0)
bytes.withUnsafeBytes { (x:UnsafePointer<(Int, Int)>) in
    y = x.pointee
}

print(y) // prints (4, 2)

Beware: this is the path to the dark side.