From: David Turner <novalis@novalis.org>
Date: Wed, 11 Jan 2017 00:11:40 GMT
Subject: git cat-file on a submodule
Message-ID: <1484093500.17967.6.camel@frank>

Why does git cat-file -t $sha:foo, where foo is a submodule, not work? 

git rev-parse $sha:foo works.  

By "why", I mean "would anyone complain if I fixed it?"  FWIW, I think
-p should just return the submodule's sha.