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34da18337e
Similar to:
8e18b43116
fix: lex sort order of listobjects backend.Walk
But now the "Versions" walk.
The original backend.WalkVersions function used the native WalkDir and ReadDir
which did not guarantee lexicographic ordering of results for cases where
including directory slash changes the sort order. This caused incorrect
paginated responses because S3 APIs require strict lexicographic ordering
where directories with trailing slashes sort correctly relative to files.
For example, dir1/a.b/ must come before dir1/a/ in the results, but
fs.WalkDir was returning them in filesystem sort order which reversed
the order due to not taking in account the trailing "/".