(^^) is not correct for Double and Float

Consider

Prelude> 2 ^^ (-1024)
0.0
Prelude> 0.5 ^^ 1024
5.562684646268003e-309

The cause is

x ^^ n          =  if n >= 0 then x^n else recip (x^(negate n))

If we change it to

x ^^ n          =  if n >= 0 then x^n else ((recip x)^(negate n))

it'll do the right thing for Double and Float, and I don't know of any type where it would produce incorrect results.

Does it need a library proposal or can the change be made without?

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