This is a very nice read https://discuss.ocaml.org/t/modules-that-extend-modules-from-third-party-packages/3777/2 about extensibility of #OCaml modules. It's worth reading even if you're not into OCaml (but other programming languages)!
@hannesm It gives less than short shrift to Lisp languages, but seems an OK intro to modular extension. Pretty tied to ML modules, though. Understandable, they're great, but not the end all.
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