git-am includes escape characters from 'From' field

From: Swift Geek <swiftgeek@gmail.com>
Date: Sep 12, 2016, 20:10 UTC
Message-ID: <op.yno0zli7ig5ot5@localhost.localdomain>

git-am seems to add backslash that escapes double quote character, example git format-patch

 From 63da989a5295214f9bd06cd7b409a86a65241eea Mon Sep 17 00:00:00 2001
From: "Sebastian \"Swift Geek\" Grzywna" <swiftgeek@gmail.com>
Date: Mon, 12 Sep 2016 21:27:32 +0200
Subject: [PATCH] Example showing git-am bug that includes escape characters

---
  testfile | 1 +
  1 file changed, 1 insertion(+)
  create mode 100644 testfile

diff --git a/testfile b/testfile
new file mode 100644
index 0000000..b48e119
--- /dev/null
+++ b/testfile
@@ -0,0 +1 @@
+test file contents

-- 
2.9.3

In .gitconfig I have
name = Sebastian \"Swift Geek\" Grzywna
which appears to work fine with regular git commit - backslashes are not  
included in 'From' field.

Regards,
Swift Geek