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Years ago, I started an implementation of that book: https://github.com/linkdd/ooduck

Never truly finished it, but it works well :)

Fyi, fwiw, the top-of-page "About Duck-Typing C library based on ooc.pdf linkdd.github.com/ooduck/ " link is currently 404.

Ah thank you, it predates Github's renaming of Github Pages from .com to .io --> https://linkdd.github.io/ooduck/