Here's an example of using intersection types and invariant typeclasses for validation! https://gist.github.com/propensive/61214bf1b7a7c4a742ae …
@tomas_mikula I would use both, but it means you get something back that *is* a `String` or an `Int'.
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@tomas_mikula I would use both, but it means you get something back that *is* a `String` or an `Int'.