From mboxrd@z Thu Jan  1 00:00:00 1970
From: Frank Li <lznuaa@gmail.com>
Subject: git format-patch
Date: Wed, 17 Jun 2009 22:03:54 +0800
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git format-patch -4
only 3 patchs is created

git format-patch -5
4 patchs is created

I remember old git version -<n>, n patchs is created.

Does it expected?