I was creating the set-valued slot API as a placeholder for something more
native, but ran out of time to work on the project before really getting it
done right. As you say, the API is awkward.
I think it would be more convenient to use lists as the slot-level API and have
a separate API for
> IV. Lacking features
I think it would be great if we also add features for:
1. Initializing slot-set from list. Something like:
(setf (numbers-of obj1) (make-slot-set :items '(1 2 3 4))
2. Wipe contents of a slot-set. You can do it via slot-makunbound, sure,
but it is kinda ugly. (setf (numb
