[GHC] #11609: Document unicode report deviations

[GHC]

#11609: Document unicode report deviations
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        Reporter:  thomie            |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Documentation     |              Version:  7.10.3
      Resolution:                    |             Keywords:  unicode,
                                     |  report-impact
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #1103, #4373,     |  Differential Rev(s):
  #7650, #10196, #11012              |
       Wiki Page:                    |
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Comment (by rwbarton):

 Oh, I was going to comment on the subject of documentation, so I'll do it
 here. We should have a changelog entry about allowing combining characters
 in identifiers; and we should be clear about what kind of normalization we
 do to decide when a sequence involving combining characters is considered
 the same as a precomposed sequence. (I assume the answer is currently
 "none", but it would probably be nice to change that for 8.2. NFC
 normalization seems to be a popular choice for programming languages.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11609#comment:2>
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