OO addict: you should compose functions, but only at the meta-level, before you compute type fix-points. Sums should always be extensible. FP addict: you should compose functions, but only at the base-level, after you compute type fix-points. Sums should never be extensible.
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A thoughtless smear - I expected better of you : P https://www.cs.kent.ac.uk/people/staff/srk21/research/papers/kell17some-preprint.pdf …
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