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Obligatory comment that elixir is now gradually typed: https://news.ycombinator.com/item?id=48388324
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Tbh gradual typing sounds like a nightmare. Probably impossible to implement correctly, whatever your definition of "correctly".
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Nah, the gradual angle is not what makes a type system tricky to implement. Plus we have published a few papers discussing how we are typing Elixir and how our approach is sound.
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