Proposal: add laziness to Data.Map / IntMap

[Sittampalam, Ganesh]

> Which naming scheme is less ugly, 
> Data.Map.mapWithKeyL or Data.Map.Lazy.mapWithKey? 

A separate module is much better, as it will allow switching entire
modules over just by changing an import, and still allow something close
to the mapWithKeyL usage via a qualified import (e.g. "import qualified
Data.Map.Lazy as L")

Ganesh


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