[GHC] #4109: Make Data.Map.insertWith' and friends consistently force the value inserted

[GHC]

#4109: Make Data.Map.insertWith' and friends consistently force the value inserted
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    Reporter:  igloo              |        Owner:              
        Type:  proposal           |       Status:  new         
    Priority:  normal             |    Milestone:  Not GHC     
   Component:  libraries (other)  |      Version:  6.12.2      
    Keywords:                     |   Difficulty:              
          Os:  Unknown/Multiple   |     Testcase:              
Architecture:  Unknown/Multiple   |      Failure:  None/Unknown
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Comment(by igloo):

 Thread starts:
 http://www.haskell.org/pipermail/libraries/2010-May/013693.html

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4109#comment:1>
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