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This should be a list of minor (mostly) backwards compatable changes to the standard libraries. Proposed new libraries should go on [NewLibraryCandidates](new-library-candidates)
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- signatures of when and unless generalized
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- move 'join' and 'ap' into the Monad class
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- remove exports of functions from libraries that are also exported by the prelude (to make overriding prelude functions easier)
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- lookup,elemIndex,find,findIndex to be generalized to return result in monad instead of forced to be a maybe
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- remove catch from the Prelude
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- behavior of `array` on repeated indices (H98: bottom, GHC: last value)
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- `read` of octal and hex `Int` constants ([ email message](http://www.haskell.org/pipermail/nhc-bugs/2004-May/000441.html))
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- swap for tuples
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- specify strictness of I/O functions ([ thread on haskell list](http://www.haskell.org/pipermail/haskell/2005-October/thread.html#16538))
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- make `groupBy` (and possibly `nubBy`) work with any relation, not just symmetric transitive ones ([ message on haskell-cafe](http://www.haskell.org/pipermail/haskell-cafe/2006-October/019148.html))
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## new simple functions
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replicateM, replicateM_, repeatM, repeatM_
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```wiki
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-- | the generalization of readIO. readIO can be deprecated if wished if this is included.
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readM :: (Read a, Monad m) => String -> m a
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readM = ...
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```
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toMaybe :: Bool → a → Maybe a (added to Maybe library) |
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- signatures of when and unless should be generalized |
