Was there ever any doubt? :)

Still requiring extensions from earlier posts:

  (def dsb-params-parse (params)
    (withs (reqs nil key? nil opt? nil keys nil opts nil
          rest (mem '&r params)
          rest-var (cadr rest)
          aok? (find '&aok cddr.rest)
           resting? nil
           no-mas nil)
    (each p params
      (if no-mas (assert nil "No params &aok, OK?" ',params)
        (is p '&o) (do (assert ~opt? "Duplicate &o:" ',params)
                       (assert ~key? "&k cannot precede &o:" ',params)
                     (= opt? t))
        (is p '&k) (do (assert ~key? "Duplicate &k:" ',params)
                       (= key? t))
        (is p '&r) (= resting? t)
        (is p '&aok) (= no-mas t)
        key? (push-end p keys)
        (and opt? (no resting?)) (push-end p opts)
        (no resting?) (do (assert (~acons p) "Reqd parameters need not be defaulted:" p)
                           (push-end p reqs))))
    (prt 're-obj!!!!! reqs opts rest-var keys aok?)
    (obj reqs reqs opts opts rst rest-var keys keys aok? aok?)))

  (mac dsb (params data . body)
  (w/uniq (tree kvs valid-keys aok?)
    `(withs (,tree ,data
              ,@(let plist (dsb-params-parse params)
                  (prn `(reqs ,plist!reqs))
                  (prn `(rst ,plist!rst))
                  (prn `(keys ,plist!keys))
                  (prn `(&aok ,plist!aok?))
                  (with (n -1)
                    (+ (mappend [list _ `(nth ,(++ n) ,tree)] plist!reqs)
                      (mappend [list (carif _) `(if (< ,(++ n) (len ,tree))
                                                    (nth ,n ,tree)
                                                  ,(cadrif _))] plist!opts)
                      `(,plist!rst (nthcdr ,(++ n) ,tree))
                      `(,valid-keys ',plist!keys)
                      `(,aok? ',plist!aok?)
                      `(,kvs (do (prt 'foing ,valid-keys)
                                 (when (and ,plist!rst ,valid-keys)
                                   (assert (even (len ,plist!rst)) "Keyword list not even" ,plist!rst)
                                   (let ,kvs (pair ,plist!rst)
                                     (prt 'vetting ,valid-keys 'againt ,kvs)
                                     (unless ,aok?
                                       (assert (all [find (car _) ,valid-keys] ,kvs)
                                         "Invalid key in" (map car ,kvs)))
                                     (prt 'kvs!!!!! ,kvs)
                                     ,kvs))))
                      (mappend [list (carif _)
                                 `(do (prt 'kvs!!! ',(carif _) ,kvs)
                                      (aif (assoc ',(carif _) ,kvs)
                                        cadr.it
                                        ,(cadrif _)))] plist!keys)))))
       ,@body)))