The “&” syntax for generic type parameters is quite useful, and it took me a little rooting around to find out the correct syntax, since the “where” keyword was used before Swift 3:
static func incrementHelper<T: Equatable & IncAndDecrementable> {
…
@chrisclark Thanks very much for your suggestion! You actually taught me something as well 
I will definitely forward your comment over to the “powers that be”
All the best!
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