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2026‑10‑08 – Covariance and contravariance: a fresh look at an old issue (a primer in advanced type systems for learning functional programmers).

• 2026‑10‑08 - Covariance and contravariance: a fresh look at an old issue (a primer in advanced type systems for learning functional programmers).
• https://www.irif.fr/~gc/papers/covcon-again.pdf
• redirect https://dotat.at/:/1792P
• blurb https://dotat.at/:/1792P.html
• atom entry https://dotat.at/:/1792P.atom
• web.archive.org archive.today