At the risk of sounding like "that guy", is this not common knowledge? I don't write a lot of Swift at all but I've read multiple introductions to the language'

At the risk of sounding like "that guy", is this not common knowledge? I don't write a lot of Swift at all but I've read multiple introductions to the language's enums which are some variety of "those Optionals we've been using for a while? They're just an enum with syntactic sugar!"