[GHC] #15078: base: Customary type class laws (e.g. for Eq) and non-abiding instances (e.g. Float) should be documented

[GHC]

#15078: base: Customary type class laws (e.g. for Eq) and non-abiding instances
(e.g. Float) should be documented
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        Reporter:  sjakobi           |                Owner:  Azel
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Core Libraries    |              Version:  8.4.2
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4736
       Wiki Page:                    |
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Comment (by Azel):

 Continuing on that vein, I think `Integral` instances are expected to form
 Euclidean rings (or is it Euclidean fields?). However, I have no idea for
 `RealFrac` instances…subsets of ℚ?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15078#comment:9>
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