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Since we're modifying this function anyway, it's a good time to update it to the more modern "struct oid". We can also drop some of the magic numbers in favor of GIT_SHA1_HEXSZ, along with some descriptive comments. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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