Proxies are some kind of in-memory forwarding pointer to data in the cache. They are never saved on disk.
(defclass proxy ()
((object-id :initarg :object-id :reader object-id)
(rucksack :initform (current-rucksack) :initarg :rucksack :reader rucksack))
(:documentation "Proxies are some kind of in-memory forwarding pointer
to data in the cache. They are never saved on disk."))
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