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由 Shawn Pearce 提交于
Normally we try to skip writing a ref if its value hasn't changed but in the special case that the ref doesn't exist but the new value is going to be 0{40} then force writing the ref anyway. Signed-off-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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