[GHC] #10067: The Read Integer instance is too slow

[GHC]

#10067: The Read Integer instance is too slow
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        Reporter:  redneb            |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  high              |               Milestone:  7.10.1
       Component:  Core Libraries    |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D645
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Comment (by ekmett):

 For now I think option 1, which basically just merged is probably the path
 forward, conversion between the new Natural and Integer is quite fast.

 Introducing more hs-boot files, just makes more work for us going forward.
 We're trying, steadily, to eliminate them from base to enable a more
 granular system in the end.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10067#comment:13>
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