What’s New in POSIX 2024 – XCU
https://blog.toast.cafe/posix2024-xcu#the-nuclear-option
> A bunch of C functions³ are now encouraged to report `EILSEQ` if the last component of a pathname to a file they are to create contains a newline (put differently, they’re to error out instead of creating a filename that contains a newline).
へえ