So I am trying to implement Result type myself just to learn the basics, while
the docs are there and good wherever they are, I can't seem to find out how to
do a discriminated union / sum type.
I want something to the effect of this in typescript:

type Ok<T> = { ok: true, data: T, error: null }
type Err<E> = {ok: false, data: null, error: E }
type Result<T, E> = Ok<T> | Err<E>

what is the most idiomatic way of doing this in nim?
Sorry, this is a bit too fundamental to be asking about and I think I need to do
my due dilligence here, but I cannot find an idiomatic way for the life of me