Are 2.1 stubs backward compatible with 2.0 stubs?
When 2.1+ encounters 2.0 stubs, it asks whether the user wishes to convert stubs to the more efficient 2.1 format. If some client versions are still 2.0 (have not yet upgraded to 2.1), nothing bad will happen but 2.0 will not find stub files, and will create new ones with the .stub suffix. Thus 2.0 will not know the check-out history, and will have its own (parallel with 2.1, but shorter) history.
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