;;; Utilities.
-(defvar *keyword-struct-disposition* :unset
+(defvar-unbound *keyword-struct-disposition*
"The current state of the keyword structure.
- This can be one of four values.
-
- * `:unset' -- the top-level default, mostly because I can't leave it
- unbound and write this documentation. Nothing that matters should see
- this state.
+ This can be one of three values.
* `:local' -- the structure itself is in a local variable `sod__kw'.
This is used in the top-level effective method.