We left off in a rather unsatisfying predicament, we can simulate OCaml functors with interfaces, but at the expense of passing in two type parameters and guarding all our functions with type constraints. Yuck!
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We used a good old fashioned subtyping and a dash of parametric polymorphism to write an eval function capable of returning different types. But surely we gave up too easily on polymorphic return types in F#? I assure you we gave them the ol’ college try.
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