"Return non-nil if VALUE is printable."
(cond
;; Quick response for oft-encountered types known to be printable.
- ((stringp value))
((numberp value))
((symbolp value))
+ ;; String without properties
+ ((and (stringp value)
+ (equal-including-properties value (substring-no-properties value))))
(t
;; For others, check explicitly.
(with-temp-buffer