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I have a UCS-2 file called a.txt. I copy it to a file called b.txt. I add a.txt using the -ku option. I then copy b.txt to a.txt. "cvs stat" says the file is locally modified. The files are byte-for-byte identical. Only their modification dates differ. The checksum is apparently taking the modification date into account (unlike non-UCS2 files, but I can't speak for UTF-8 files).