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With SHA-256, the length of the all-zeros object ID is longer. Add a function to git-submodule.sh to check if a full hex object ID is the all-zeros value, and use it to check the output we're parsing from git diff-files or diff-index. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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