> In my experience if you land on a design that looks like something either Go or F# does then you're probably on the right track

Well, let's just say that our experiences are vastly different then, but I had to do a double take when I saw Go mentioned as a positive from a PL design perspective..

And no, Go can literally return both a value and an error at the same time, it has possibly the worst error handling out of any "modern" language.