Rich,

on Sat, 24 Jun 2023 13:24:55 -0400 you (Rich Felker <dalias@libc.org>)
wrote:

> OK, so to be clear, WG14 is making the change proposed in
> https://austingroupbugs.net/view.php?id=1647 and changing the standard
> to specify that printf("%lc", L'\0') should produce 1 NUL character?

yes

the text that was adopted reads

    If an `l` length modifier is present, the `wint_t` argument is
    converted as if by a call to the `wcrtomb` function with a pointer
    to storage of at least `MB_CUR_MAX` bytes, the `wint_t` argument
    converted to `wchar_t`, and an initial shift state.

Jₑₙₛ

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