mistake in Data.Set description
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Data.set description in HTML documentation contains the following text
difference :: Ord a => Set a -> Set a -> Set a
O(n+m). Difference of two sets. The implementation uses an efficient hedge algorithm comparable with hedge-union.
intersection :: Ord a => Set a -> Set a -> Set a
O(n+m). The intersection of two sets. Elements of the result come from the first set.
I think that phrase "Elements of the result come from the first set" relates to difference function, not to intersection