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> foldMap _ Tip = mempty foldMap f (Bin _ _ v l r) = Foldable.foldMap f l > `mappend` f v `mappend` Foldable.foldMap f r > > Btw, from my perspective, one problem with relying on foldMap is that it treats the whole structure uniformly, whereas the split approach would let one, for example, bottom out to a sequential implementation at a certain granularity. Perhaps that is the "boilerplate for controlling recursion" that you referred to... but isn't it sometimes necessary? -Ryan
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