The manual says in (info "(elisp)Text Properties") that
Each property has a name and a value. Both of these can be any
Lisp object, but the name is normally a symbol.
However, `propertize' doesn't let you create a string with property
names that are not symbols:
(propertize "foo" 0 t) => error: (wrong-type-argument symbolp 0)
The CHECK_SYMBOL test in Fpropertize should be removed.
This code in `describe-property-list' has to be changed as well to
deal with property names that are not symbols (note that the comment
is wrong, btw) or M-x describe-char will signal an error when trying
to describe such text:
[...]
;; Sort the properties by the size of their value.
(dolist (elt (sort (let (ret)
(while properties
(push (list (pop properties) (pop properties)) ret))
ret)
(lambda (a b) (string< (nth 0 a) (nth 0 b)))))
[...]
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