I'm also seeing this in cljs-time in both "0.0-2411" and "0.0-2511". The call 
to cljs.core// can never be reached with a nil 'millis, but the compiler still 
gives the warning.

WARNING: cljs.core//, all arguments must be numbers, got [#{nil clj-nil} 
number] instead. at line 51 src/cljs_time/coerce.cljs

(defn to-epoch
  "Convert `obj` to Unix epoch."
  [obj]
  (let [millis (to-long obj)]
    (and millis (/ millis 1000))))

OR

(defn to-epoch
  "Convert `obj` to Unix epoch."
  [obj]
  (when-let [millis (to-long obj)]
    (/ millis 1000)))

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