packet:          git> command=smudge

packet:          git> pathname=path/testfile.dat

packet:          git> 0000

packet:          git> 0000  # empty content!

packet:          git< status=success

packet:          git< 0000

packet:          git< SMUDGED_CONTENT

packet:          git< 0000

packet:          git< 0000  # empty list, keep "status=success" unchanged!