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Fwiw, I never appreciated type systems till I learned Haskell, which showed me that mere data types do not a type system make. Type classes, signatures based on currying, an entire language designed around sophisticated type theory, it was probably the biggest eye opener since grokking lisp's code is data is code paradigm. But most undergrad education is C, C++, Java, and maybe Python these days, and don't get me started on Rails schools. You tend not to learn this stuff unless you hang out at HN, or Reddit back in the day, or read PG's essays, or are just naturally curious.



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