[aystatic]

I don't necessarily disagree with the overall point, but I'm sad the article misses the big advantage to the sum-type solution. It is not just about "being able to collapse `res, err := func()` into `res := func()?`". With sum types you literally cannot access the Result's inner value without performing some kind of error handling. Even if you just `.unwrap()`.

from https://fasterthanli.me/articles/i-want-off-mr-golangs-wild-...

> The point is, this function signature makes it impossible for us to access an invalid/uninitialized/null Metadata. With a Go function, if you ignore the returned error, you still get the result - most probably a null pointer.