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This also affects ls -v in some corner cases. Problems reported by Michael Debertol <https://bugs.gnu.org/49239>. While looking into this, I spotted some more areas where the code and documentation did not agree, or where the documentation was unclear. In some cases I changed the code; in others the documentation. I hope things are nailed down better now. * doc/sort-version.texi: Distinguish more carefully between characters and bytes. Say that non-identical strings can compare equal, since they now can. Improve readability in various ways. Make it clearer that a suffix can be the entire string. * src/ls.c (cmp_version): Fall back on strcmp if filevercmp reports equality, since filevercmp is no longer a total order. * src/sort.c (keycompare): Use filenvercmp, to treat NULs correctly. * tests/misc/ls-misc.pl (v_files): Adjust test to match new behavior. * tests/misc/sort-version.sh: Add tests for stability, and for sorting with NUL bytes.