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由 Jeff King 提交于
The read-cache implementation defines this static function, but it is a generally useful concept in git. Let's give the empty blob the same treatment as the empty tree, providing both hex and binary forms of the sha1. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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