That's fine for internal functions, but a big problem when publishing any kind of interface. It's really nice to be able to extend an interface without breaking stuff or adding cruft.

true, forgot to think about that. But still potentially a lot of changes to fix, even if you are explicitly told what needs adjusting.

And this is where Go's tooling shines: https://golang.org/cmd/gofmt/

(Refactor automatically, not by hand.)