James -- just the kind of simplification I was looking for! In fact, I 
think the following will do everything I need --- generate numbers avoiding 
only NaN (which isn't equal to itself, nor less than anything)

(s/def ::virtual-time
  (s/with-gen
    (s/and
     number? #(not (Double/isNaN %)))
    ;; We'd like most values generated in tests to be finite, with the
    ;; occasional infinity for spice. Adjust these frequencies to taste.
    #(gen/frequency [[98 (s/gen number?)]
                     [ 1 (gen/return Double/NEGATIVE_INFINITY)]
                     [ 1 (gen/return Double/POSITIVE_INFINITY)]])))



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