[vector] #21: Add iterate and another form of unfoldr

[vector]

#21: Add iterate and another form of unfoldr
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Reporter:  Khudyakov    |        Owner:     
    Type:  enhancement  |       Status:  new
Priority:  major        |    Milestone:  0.7
 Version:               |   Resolution:     
Keywords:               |  
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Changes (by rl):

  * priority:  minor => major

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Ticket URL: <http://trac.haskell.org/vector/ticket/21#comment:2>
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