[GHC] #2813: Create a utf8 bytestring-a-like

[GHC]

#2813: Create a utf8 bytestring-a-like
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    Reporter:  igloo              |        Owner:                  
        Type:  bug                |       Status:  new             
    Priority:  high               |    Milestone:  6.12 branch     
   Component:  libraries (other)  |      Version:  6.10.1          
    Severity:  normal             |   Resolution:                  
    Keywords:                     |   Difficulty:  Unknown         
    Testcase:                     |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple   |  
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Comment (by tibbe):

 The `text` library was released quite a while ago. Should we close this
 ticket and create separate tickets to track libraries that need to switch
 from `FastString` to `Text`?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2813#comment:4>
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