Proposal: Add a strict version of foldlWithKey to Data.Map

[Johan Tibell]

Hi,

The current API doesn't offer any efficient way to do something simple as
e.g. summing the values in a map. I suggest we add a foldlWithKey' function:

    http://hackage.haskell.org/trac/ghc/ticket/4261

Discussion deadline: 2 weeks

Cheers,
Johan
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