How are specification issues / defects of POSIX collected and how can I participate?

While [pondering whether IEEE 1003.1-2017 forbids race-condition safe ln -f](https://unix.stackexchange.com/questions/794236/idiomatic-way-of-generating-a-unique-filename/794239#comment1526091_794239) , it occurred to me: Even if this is really an unfortunate definition (which GNU coreutils' ln thankfully ignores), I would have no way to say "hey, dear standardizers, next iteration, maybe don't specify this broken thing, and instead demand this safe thing, or at least don't prohibit safe implementation". How does the evolution of the POSIX / IEEE 1003.1 standard actually happen? How can the interested public participate, if at all?