* Add test case for return type of (setf slot-value-using-class)
* symbol slot
* generalized-boolean slot
+* column and table constraints in CREATE-TABLE and DEF-VIEW-CLASS.
+* escaping of single quotes
OPTIMIZATIONS
* Revisit result-type list creation, perhaps caching
* Rework LIST-ATTRIBUTE-TYPES and LIST-INDEXES such that they exhibit their
current behaviours using single database queries.
+* Possible use of cached attribute type information for operations which
+ insert/update records as mentioned in the CommonSQL user guide.
POSSIBLE EXTENSIONS