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The per-index collation version tracking feature was reverted, but we still have the ability to ask Windows (352f6f2d) and FreeBSD (ca051d8b) for collation versions to store in pg_collation.collversion. So, from the reverted patch, take a few words of documentation about libc on all three supported OSes to replace the pre-existing note that mentioned only glibc. Discussion: https://postgr.es/m/CA%2BhUKGLhj5t1fcjqAu8iD9B3ixJtsTNqyCCD4V0aTO9kAKAjjA%40mail.gmail.com