Sum Types and Subtypes and Unions(blog.jle.im)
blog.jle.im
Sum Types and Subtypes and Unions
https://blog.jle.im/entry/sum-types-and-subtypes-and-unions.html
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Clearing up some common misunderstandings and easy to miss concepts
https://blog.jle.im/entry/sum-types-and-subtypes-and-unions.html