Classes do not have a prefix

[uliwitness]

Apple reserves all un-prefixed and two-letter prefixed class names for itself. If Apple ever creates a class named Mixin (even internally in a framework, like it happened for "Account" a while ago), an app using this code will talk to the wrong class and crash. Could you please add your three-letter-prefix to the classes in there?

Thank you! And great work sharing this.