(etypecase val
(string (if (string= "0" val) nil t))
(integer (if (zerop val) nil t))))
(defmethod read-sql-value (val (type (eql 'generalized-boolean)) database
(etypecase val
(string (if (string= "0" val) nil t))
(integer (if (zerop val) nil t))))
(defmethod read-sql-value (val (type (eql 'generalized-boolean)) database