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由 Junio C Hamano 提交于
The internal implementation of diff-index codepath used to use non const pointer to pass sha1 around, but it did not have to. With this, we can also lose the private no_sha1[] array, as we can use the public null_sha1[] array that exists exactly for the same purpose. Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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