[vector] #84: Add strict versions of mapM and friend

[vector]

#84: Add strict versions of mapM and friend
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Reporter:  tibbe        |       Owner:     
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:     
 Version:               |    Keywords:     
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 I had a big space leak due to using mapM and I had to roll my own `mapM'`
 that goes via lists. It would be nice if the library included `mapM'` and
 `forM'`, as they're hard to write outside the library due to having to go
 through the streaming machinery.

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Ticket URL: <http://trac.haskell.org/vector/ticket/84>
vector <http://trac.haskell.org/vector>
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