From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mike Hommey <mh@glandium.org>
Subject: Score in diff-format
Date: Wed, 28 Jan 2015 15:23:09 +0900
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Hi,

diff-format.txt says this:

  An output line is formatted this way:
  (snip)

  That is, from the left to the right:

  (snip)
  . status, followed by optional "score" number.

  (snip)
  Status letters C and R are always followed by a score (denoting the
  percentage of similarity between the source and target of the move or
  copy), and are the only ones to be so.

As I read this last paragraph, the following is not supposed to happen:
$ git diff-tree 926b1ec63ee045503f609e88ca445b94c06bd5d7 --abbrev -r -C -B
926b1ec63ee045503f609e88ca445b94c06bd5d7
:100644 100644 81ac702... 7ab0cf4... M087       contrib/subtree/INSTALL

It however makes sense that it happens, and it looks like a case of the
documentation being outdated or confusing. Or am I interpreting it wrong?

Cheers,

Mike