makunbound when +unbound-slot+ is passed to default setter for slot attributes
drwxr-xr-x - doc
-rw-r--r-- 682 lisp-on-lines-ucw.asd
-rw-r--r-- 3059 lisp-on-lines.asd
drwxr-xr-x - src
drwxr-xr-x - tests