I have used Go in production for enterprise/business systems since 2015 and what I miss most is true sum types that really limits the state space of composite t

I have used Go in production for enterprise/business systems since 2015 and what I miss most is true sum types that really limits the state space of composite types. It’s being discussed somewhat actively for Go 2, and I would love to see more support for the idea. It’s really useful for business logic.