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Arithmetic comments

p. 148 says that

	(make <complex> angle: a) == (make-polar 0 a) 

This is presumably equivalent to (make-rectangular 0 0), since the
only kind of non-real <complex> is <rectangular-complex>.

What use is it?  Is it just for symmetry?  A default magnitude of 1
would be far more useful.

Note that the smoothness argument does not apply, since it is
statically manifest that there is no specified magnitude.