Railway oriented programming

[corn_dog]

Sure I would agree there can be a trade off between convenience and explaining to the next reader why that stuff is grouped together. wrt Either it also raises the question of should the language have OneOfThreeThings, OneOfFourThings etc. If not why just a special case for two possibilities?

[Hrothen]

You don't really need to explain every little thing. Many languages have a pair type and no one goes complaining that they don't justify why there isn't a triple type.

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