title: How to obtain the effective git-config values and their source?
body: <p>I know <a href="https://stackoverflow.com/a/33720449/321973"><code>git-config</code> doesn't know all possible default values</a>, but is there any way to see not only which config values apply to the current repo but also <em>which</em> config (local, global, system) is responsible?</p>