snoyberg/conduit — pull request #148 by RobotGymnast (2014-04-22 03:21:47+00:00)
Title: More familiar `scanl`; add `mapAccum`, `mapAccumM`

Made scanl more closely resemble Prelude.scanl.
Added mapAccum and mapAccumM to replace previous scanl and to be analogous to Data.Traversable.mapAccumL.