(declare (type (integer 0 #.+max-hash-depthoid+) depthoid))
(let* ((layout (%instance-layout key)) ; i.e. slot #0
(length (layout-length layout))
(declare (type (integer 0 #.+max-hash-depthoid+) depthoid))
(let* ((layout (%instance-layout key)) ; i.e. slot #0
(length (layout-length layout))