Change is in the air! Untyped zero, coroutines, and improved http.ServeMux.

• Go 1.21RC3 released (https://groups.google.com/g/golang-announce/c/5golCy-_yK0) • 🎉 (https://emojipedia.org/party-popper/) loopvar fix has been ACCEPTED! (https://github.com/golang/go/issues/60078) Likely to be included in 1.22 • Blog post: Coroutines for Go by Russ Cox • 🌐 net/http.serveMux routing improvements (https://github.com/golang/go/issues/61410) is now an official proposal • 0️⃣ New proposal: add an untyped zero (https://github.com/golang/go/issues/61372) • Echo 4.11.0 released (https://github.com/labstack/echo/releases/tag/v4.11.0)

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