GETF-ALL (PLIST KEY &OPTIONAL (DEFAULT NIL DEFAULT-P))
This is a version of `getf' enabled to manage multiple keys. If the `plist' has two or more pairs that they have given `key' as a key, returns the values of each pairs as one list.
SETFGETF-ALL (VAL PLIST KEY &OPTIONAL (DEFAULT NIL DEFAULT-P))
Changes the stored value(s) of the given `key'. This removes or adds pairs as necessary to store the new list.
If CONS is a cons, it is returned. Otherwise returns a fresh cons with CONS in the car, and NIL in the cdr.
REMF-ALL (PLIST KEY)
Removes a key and associated values for the given `key'.