But ... haven't we established that the en-US locale week numbering system is not really based on anything sensible. So how the user can have any sensible expec

But ... haven't we established that the en-US locale week numbering system is not really based on anything sensible. So how the user can have any sensible expectation of what they get as a reply when they ask for a week number? I tried to research the glibc version control history of how it came to be like this. I think it's completely arbitrary, and at times en-US did use ISO 8601 weeks.