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@whitequark I see the wiki page is only from 2015 while the usage in libstdc++ was basically remove in 2001 (3.0 was released then). This means someone sat down and wrote down what was done over 15 years ago to make sure it was documented correctly on how it worked. Even though it was no longer in use or could be used.
From what I read on the glibc list recently is they are looking to see if they can change some of this libio stuff.
E.g. https://sourceware.org/pipermail/libc-alpha/2024-September/159942.html