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a guest May 24th, 2018 63 Never
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  1. (defun ensure-string (thing)
  2.   "Make THING into a string if at all possible."
  3.   (the (values string &optional)
  4.     (typecase thing
  5.       (string thing)
  6.       (symbol (symbol-name thing))
  7.       (class (class-name thing))
  8.       ;; slow, worst case!
  9.       (t (princ-to-string thing)))))
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