[GHC] #605: Optimisation: strict enumerations

[GHC]

#605: Optimisation: strict enumerations
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  Reporter:  simonmar                 |          Owner:                  
      Type:  task                     |         Status:  new             
  Priority:  normal                   |      Milestone:  _|_             
 Component:  Compiler                 |        Version:  None            
Resolution:  None                     |       Keywords:                  
  Testcase:  N/A                      |      Blockedby:                  
Difficulty:  Difficult (2-5 days)     |             Os:  Unknown/Multiple
  Blocking:                           |   Architecture:  Unknown/Multiple
   Failure:  Runtime performance bug  |  
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Comment(by simonmar):

 Also requested in #4936

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/605#comment:12>
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