I think that we do not yet have enough data. Too little cases are known for which unsigned integer converters are needed, and different cases require a different behavior. I prefer to defer until we convert the majority of the code. Then we will see what behavior is most prevalent. We even can change and unify behavior in 3.5.

There is no hurry. We can use in each module its own Converter (if needed). There should not be many such places.