TCP support has been MUST implement for stub resolvers since 2016, so musl is several years late https://www.rfc-editor.org/rfc/rfc7766#page-6
Re:Musl 1.2.4 adds TCP DNS fallback
by yjftsjthsd-h on Monday July 31, 2023 @01:40AM
(#36939164)
Okay, then they haven't been standards-compliant for a very long time, which is a much more compelling point than arguing that they should be doing things beyond the standard.
The reason the DNS TCP requirements RFCs were written was because of boneheads who don’t believe people who tell them it has been a non-optional part of the protocol since the 1980s
You are mistaken. That is only a proposal to change the standard.
"It's a catastrophe, but of little importance" -- Zizek
"RFC" is Request For Comments. Some RFCs become standards. But there are no internet police, notwithstanding that the internet is a fascist state (run by corporations for the benefit of corporations). Understanding it as a fascist state is the rational way to view "enforcement" as well as the natterings over whether something is a standard and who is going to enforce it anyway.
Or in other words they've always been standards-compliant, and when the standard changed they updated to match it.