How to bridge Swift String to Objective C NSString?

Question

Am I taking crazy pills? Directly out of the documentation:

“Swift automatically bridges between the String type and the NSString class. This means that

Answer 1

To go from String to NSString use the following constructor:

let swiftString:String = "I'm a string."
let objCString:NSString = NSString(string:swiftString)

With Xcode 7 (beta), using a downcast from String to NSString, as in below example, will result in a warning message, Cast from 'String?' to unrelated type 'NSString' always fails:

let objcString:NSString = swiftString as! NSString // results in error