I would appreciate any advice on the best way to copy a prefab struct that
could be a sub-struct.  I have been using write/read but felt bad about it.
Trying again now gave me a new option. Is there a better solution out there?

(define (copy-writable s)
  (read (open-input-string (with-output-to-string (lambda () (write s))))))

(define (copy-prefab s)
  (call-with-values (lambda () (vector->values (struct->vector s) 1))
                    (lambda args (apply make-prefab-struct
(prefab-struct-key s) args))))


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