You have no idea how pleased I am to be able to pass generic methods to reduce.
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wait wait wait, what's that now?
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reduce(sequenceOfSets, Set(), uncurry(Set.union))
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ok… it's not really a generic func getting passed, right? the type inference is just figuring it out better? just checking.
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Correct. It’s just that before, you had to pass { $0.union($1) }, which is bogus.
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sorry, not following why not just return f(fix(f))?
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Right that's what Rob said. Not seeing how that applies here? May have Haskelled too hard
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Right. So fix as defined in Prelude is the appropriate combinator for by-value semantics.