I'm reading on http://www.lispcast.com/reduce-complexity-with-variants and have seen Jeanine's talk on her encoding scheme for sum types, but for some reason, I'm not convinced of the benefit over a tagged record encoding. I see that the positional vector or hash-map suggested in the lispcast article has a theoretically smaller number of states, but because it lacks names, it seems at a higher risk of human error. Anyone has thoughts on this? And now that we have specs, I feel like a multi-spec would address concerns of the tagged record encoding by being able to validate that the correct set of keys exist for the given type, while also having the benefit of named fields. What do others think?
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