Fixing floating point conversions.

[Sittampalam, Ganesh]

Nick Bowler wrote:
> 
> *** Idea #3 ***
> 
> Use a multi-parameter type class:

We couldn't go down this route until MPTCs themselves are added to the
language, which I think is unlikely to be soon as the whole fundeps/type
families issue is still unresolved.

Ganesh

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