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It was made a requirement by RFC 7766 in 2016 https://www.rfc-editor.org/rfc/rfc7766#page-6 https://www.rfc-editor.org/rfc/rfc7766#page-6

• dralley 3y ago
  That doesn't necessarily contradict "the DNS standards people got fed up with people not implementing it, and made it a requirement."?
  • fanf2 3y ago
    It took musl about 6 years to implement the requirement.