I'm a bit surprised about these questions.
Can't you just peek into the source of low? and upp? even from the REPL?

I'm not using picolisp lately but I remember vaguely it had the same
feature as Clojure:

=> (source clojure.string/upper-case)

(defn ^String upper-case
  "Converts string to all upper-case."
  {:added "1.2"}
  [^CharSequence s]
  (.. s toString toUpperCase))


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