[GHC] #3399: Generalize the type of Data.List.{deleteBy, deleteFirstsBy}

[GHC]

#3399: Generalize the type of Data.List.{deleteBy, deleteFirstsBy}
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 Reporter:  iago              |          Owner:                  
     Type:  proposal          |         Status:  new             
 Priority:  normal            |      Milestone:                  
Component:  libraries/base    |        Version:  6.10.4          
 Severity:  normal            |     Resolution:                  
 Keywords:                    |       Testcase:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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Comment (by maeder):

 Another argument against this proposal is, that an "equality" function
 taking different argument types is rather unintuitive. Who actually needs
 this generalization and is able to understand this from the documentation?
 Orthogonality would also require to check if the other "By"-functions can
 be generalized to swallow an "(b -> a -> Bool)" argument. (Indeed
 `intersectBy` could be generalized, too.)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3399#comment:4>
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