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by grovehaw 2875 days ago
One way to use Common Lisp with a more immutable flavour is to use the folio2 library.[0]

I have enjoyed exploring it a great deal. The project's readme, explains it better than I can:

"folio 2 is a collection of small libraries that provide support for functional idioms and data structures in Common Lisp and a common set of APIs for working with them.

"It's a direct descendant of the older and simpler folio library, with a greatly expanded and reorganized API, and support for more data structures and procedures.

[0] https://github.com/mikelevins/folio2