Make Prelude's map = fmap

Isaac Dupree ml at
Mon Jun 24 09:56:23 CEST 2013

I'm indifferent; I either use, etc. for explicitness,
or fmap for generality.  I'll keep doing this regardless of what is.  By the way, not all mappable types can be in Functor,
e.g. Set and ByteString.


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