Should foldl' be added to the post-"Plan FTP" Prelude

Bob Ippolito bob at
Tue Feb 24 20:42:29 UTC 2015

(Cross-posted from haskell-cafe as suggested by Carter Schonwald)

I would love to have foldl' as part of the Prelude. I use it quite
frequently and it seems like a beginner trap to have foldl but not foldl'
(which is almost always the better choice). I see that foldMap has been
added (in addition to all of Monoid and Traversable), why was foldl' left

It might be good measure to add foldr' as well, although I use that much
less frequently.

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