* Re-work not-more-contagious to return True for a wider range of
valid types. * Restrict the (+ x 0) transform to rationals, because (+ -0.0 0) is 0.0, not -0.0.
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valid types. * Restrict the (+ x 0) transform to rationals, because (+ -0.0 0) is 0.0, not -0.0.