@b0rk figuring out where a git config is being picked up from, given there's system, global, and local sources. Having to run `git config get` 3 times is not fun!

Git on macOS (might be a Homebrew thing) has git-credential-osxkeychain hardcoded as a default credential helper and I had a bear of a time figuring out how to fully replace it with git-credential-oauth.