IPFS is becoming more widely adopted!
It does solve a real problem: having a small blog collapse from HN or Slashdot users is silly. It feels rather like a more general solution for a CDN. https://twitter.com/Cloudflare/status/1041674183946764288
miniblog.
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pledge() and unveil() are gradually being adopted by operating systems other than OpenBSD:
Interesting to see that Swift has adopted checked exceptions: https://docs.swift.org/swift-book/LanguageGuide/ErrorHandling.html
I haven't seen many languages favour this feature after Java practices have gradually moved away from it.
Safe and Secure: Ada 2012 https://www.adacore.com/knowledge/technical-papers/safe-and-secure-software-an-invitation-to-ada-2012/ (criticises C, many other languages have adopted some ideas, but the subtyping is elegant)