;; This table parallels the KV vector, and is used to chain together
;; the hash buckets, the free list, and the values needing rehash, a
;; slot will only ever be in one of these lists.
;; This table parallels the KV vector, and is used to chain together
;; the hash buckets, the free list, and the values needing rehash, a
;; slot will only ever be in one of these lists.