t / t5100 / comment.expecton commit get_short_oid: sort ambiguous objects by type, then SHA-1 (5cc044e)
   1Author: A U Thor (this is (really) a comment (honestly))
   2Email: somebody@example.com
   3Subject: testing comments
   4Date: Sun, 25 May 2008 00:38:18 -0700
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