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The relationship between an object X and another object Y that replaces the object X is defined only within the scope of a single repository. The exception in reachability rule around these replacement objects is also local to a repository (i.e. if traversal from refs reaches X, then both X and Y are reachable and need to be kept from gc). Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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