This is exactly where "reify" is used for. There is a succinct piece of
description in "The Joy of Clojure" on Page 198, from where I quote the
following code example: (FIXO is a protocol like your symbolicExpr)
(defn fixed-fixo
([limit] (fixed-fixo limit []))
([limit vector]
(reify FIXO
(fixo-push [this value]
(if (< (count vector) limit)
(fixed-fixo limit (conj vector value))
this))
(fixo-peek [_]
(peek vector))
(fixo-pop [_]
(pop vector)))))
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