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The 'ref_update.index' variable is used to store an index for a given reference update. This index is used to order the updates in a predetermined order, while the default ordering is alphabetical as per the refname. For large repositories with millions of references, it should be safer to use 'uint64_t'. Let's do that. This also is applied for all other code sections where we store 'index' and pass it around. Reported-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>