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[no subject]

I do not agree with VaughanW.REFLECS that sqrt(-4) "ought" to return 
(2*i, -2*i) or ERROR.  I think most LISP users would expect 2*i or ERROR.
(Who's to say "sqrt" doesn't mean principal branch of sqrt, anyway?
LISP documentation should make this clear.)
After all, how many LISPs now return (2.0, -2.0) for (sqrt 4.0) ?