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One of the bullet points is "Abstract data types (with `Option` and `Result` predefined)." I wonder if they mean "Algebraic data type", since I have seen Option/Result before as an example of those, and they're both commonly abbreviated ADTs. Or maybe they're trying to get at a concept I'm missing here?


Yeah, that's a mistake on my part. I pushed a fix just now. Thanks for the tip.


ADTs are not neccessary to implement Option.




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