[GHC] #9818: Add `Natural` number type to `base`

[GHC]

#9818: Add `Natural` number type to `base`
-------------------------------------+-------------------------------------
       Reporter:  hvr                |                   Owner:
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Compiler           |                 Version:
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:  #3650              |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 See original proposal at

   http://thread.gmane.org/gmane.comp.lang.haskell.libraries/23300

 which was generally met with unanimous support for adding such a type.

 Request for CLC-arbitration (and its conclusion) on two more or less
 controversial details lacking consensus:

   https://groups.google.com/forum/#!msg/haskell-core-
 libraries/CVylSkkHCWE/Cqn7VEgR24sJ

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9818>
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