[vector] #2: cons, snoc, (++) and concat should use copy when possible

[vector]

#2: cons, snoc, (++) and concat should use copy when possible
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Reporter:  rl           |        Owner:     
    Type:  enhancement  |       Status:  new
Priority:  critical     |    Milestone:     
 Version:  0.6          |   Resolution:     
Keywords:               |  
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Changes (by rl):

  * priority:  major => critical


Comment:

 This is quite critical for vector-bytestring.

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Ticket URL: <http://trac.haskell.org/vector/ticket/2#comment:8>
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