In f# you can use a single case discriminated union to get that behaviour fairly cheaply, and ergonomically. https://fsharpforfunandprofit.com/posts/designing-

In f# you can use a single case discriminated union to get that behaviour fairly cheaply, and ergonomically. https://fsharpforfunandprofit.com/posts/designing-with-types-single-case-dus/ https://fsharpforfunandprofit.com/posts/designing-with-types...