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Multiple-valued SQRT

RMS's idea that (MULTIPLE-VALUE (X Y) (SQRT -4)) sets X and Y to 2i and -2i
is interesting.  There are problems with extending the idea, however.
If we also agree that (SQRT X) = (EXPT X 0.5), then we have that
	(EXPT X 0.25)
should return four values,
	(EXPT X 0.0625)
returns sixteen, and so on.
Worse yet, complex LOG has an infinite number of values.