title: What's the default value for Git `rebase.instructionFormat` config variable?
body: <p>Git 2.6 added the <a href="https://git-scm.com/docs/git-rebase#Documentation/git-rebase.txt-rebaseinstructionFormat" rel="nofollow noreferrer"><code>rebase.instructionFormat</code> config variable</a> for configuring the format of the interactive rebase instruction lines. As per the documentation, the different <a href="https://git-scm.com/docs/pretty-formats" rel="nofollow noreferrer">formatting options</a> one can choose come from <code>git log</code>. But the documentation does not state, that if one were to start customizing this config, what is the default value for that variable?</p>