Martin v. Löwis <mar...@v.loewis.de> added the comment: The documentation should explain what a "common path prefix" is. It can't be the path to a common parent directory, since the new function doesn't allow mixing absolute and relative directories. As Phillip Eby points out, it also doesn't account for case-insensitivity that some file systems or operating systems implement, nor does it take into account short file names on Windows.
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