It's only been a few years since I've come to feel I can rely on C compilers all supporting C99, for a library I'm maintaing [1]. And after a couple of years, sure enough - I get an issue opened asking for C89 compatibility because of some arcane embedded toolchain or what-not.
So, C23? ... that's nice and all, but, let's talk about it in 20 years or so T_T