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Revenge of the Ballot

    B1. OK.  One possible disadvantage is that floating-point contagion
    is not guaranteed to work.  That is, floating point has an upper
    bound, whereas bignum's don't.  What would you do with
    (COMPLEX 1E-5 ZILLION), where ZILLION is a very big bignum?

We would do the same thing as we would do in the case of (+ 1E-5 ZILLION).
We would try to float the ZILLION in this format, and if it was too
large to fit, we'd get a floating-overflow error.