Talk about <sha1_file.c> and <object.h> family, things like
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read_sha1_file()
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read_object_with_reference()
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has_sha1_file()
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write_sha1_file()
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pretend_sha1_file()
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lookup_{object,commit,tag,blob,tree}
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parse_{object,commit,tag,blob,tree}
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Use of object flags
(JC, Shawn, Daniel, Dscho, Linus)