My understanding of @avibryant's talk on Abelian Groups & aggregation as a post on aggregation monoids:
http://www.brdyorn.com/posts/2016-06-05-monoidal-sum.html …
#haskell
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Not obvious to me either. foldM just looks like fold with a monadic result.
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I'm told this is isomorphic to haskell's FoldM, though that's not obvious to me (not knowing much haskell)
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