Better implementation of Show instance for Data.Scientific

[watashi]

Hi there,

Data.Scientific just introduced a new implementation of Show instance to
display "integers" without radix point or fractional part and display
"real numbers" more nicely. While I do like the new formated output, the
implementation seems overkill and scared me, so I commented my thought
on github:
https://github.com/basvandijk/scientific/commit/9f6cbe9192d88becb7dcf3dbce3b6018ba21d9ca

Now, I post here to ask for people's opinion on this as suggested by
Bas van Dijk. Thanks.

-- 
Sincerely,

Zejun Wu (watashi)
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