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I think what this planet needs is a comprehensive study of how different typing techniques and schools of thought would solve different classes of problems, because what I notice is that

1) definitions are hard, and don't mean much

2) there are many equivalences, and some idioms are conceptually very similar across different type systems, and are just not implemented the same way. For example, a it's a common hobby among FP weenies to show how most of the GoF design patterns are one-liners in their languages of choice.

3) the scope of many typing disciplines is not the same; for example, unityped languages work great for tasks of limited scope with lots of user interface components, functional is historically used to write nice algorithms, and OOP is an attempt at giving a distinct shape to software of very large scope (and it happens to be a pain in the ass when the scope isn't that large)




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