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corresponding filename, parent, contents or other changes.
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knit1_format = bzrdir.BzrDirMetaFormat1()
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knit2_format = bzrdir.BzrDirMetaFormat1()
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# we start with a knit1 repository because that causes the
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# root revision to change for each commit, even though the content,
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# parent, name, and other attributes are unchanged.