Tuple reflection crashing on iOS 7?

Since the last update of my app (using new iOS SDK 9.3) tuple reflection crashes on iOS 7. This code

let t = (5,5,5,5,5,5,6,6,6,7,7,7,7,7)
let m = Mirror(reflecting: t)

generates an "EXC_BAD_ACCESS" on iOS 7 (and maybe only 32-bit devices as I got reports only from iPhone 4, 4S, 5 and iPad 2, Mini, 3).

The same code works fine on iOS 9 and that

Am I missing something? Is this a bug at Apple? What could be an alternative to make this work? (I'm using tuple reflection to turn the machine field of utsname() into a String)