[GHC] #7045: The `Read` instance of `Rational` does not support decimal notation (was: The `Read` instance of `Rational` does not support exponential notation)

[GHC]

#7045: The `Read` instance of `Rational` does not support decimal notation
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  Reporter:  maeder            |          Owner:                  
      Type:  bug               |         Status:  new             
  Priority:  normal            |      Milestone:  7.6.1           
 Component:  libraries/base    |        Version:  7.4.2           
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:  #7044, #5692    
-------------------------------+--------------------------------------------

Comment(by maeder):

 I wonder if the read instance should allow too large exponents. 3 digits
 would be enough without leading zeros.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7045#comment:7>
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