[GHC] #9936: Data.Fixed truncates 5.17 to 5.16

[GHC]

#9936: Data.Fixed truncates 5.17 to 5.16
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        Reporter:  singpolyma        |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.6.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9231, #9240      |  Differential Rev(s):  Phab:D1693
       Wiki Page:                    |
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Comment (by bernalex):

 I tried this (see the differential), but it breaks things like read
 "38.009" :: Centi being the same as 38.009 :: Centi, which is not very
 nice.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9936#comment:10>
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