Uppercase UUIDs on iOS

If you work in a cross-platform company, you realise iOS is the only one to output upper-case UUIDs. Which is odd. Apple purport to respect RFC 4122, and while that states uppercase characters are within the valid set, it also states “The hexadecimal values “a” through “f” are output as lower case characters and are case insensitive on input.”

So I’m thinking Apple’s implementation is wrong.