Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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Also, I don’t think the visitor pattern is a hack. Rustc code base uses visitors for ADTs. Visitors with default behavior mean if ADT adds a new variant, existing visitors don’t break which is valuable sometimes. Visitor vs match is open vs closed.
And for ECS, it’s a dynamic way of extending records. It’s hacky in the same way dynamic typing is. Basically just means every object becomes a Map<TypeId, Type>. But you could conceptually do the extensible stuff statically with enough language support.
