- Cast
(define-polymorphic-function cast (object type))Casts an object to a specified type. Type should always be a symbol. Non-mutating, i.e. always returns a new object.
- Copy
(define-polymorphic-function deep-copy (object))
(define-polymorphic-function shallow-copy (object))Deep-copy copies object recursively, while shallow-copy only copies the topmost container, leaving insides as references. Returns object of precisely the same type as the original one.