Why no examples of `config.yaml` ?!

Is there some reason the docs don’t include an example of config.yaml ?

YAML is a finicky format and it’s so easy to screw up indentation, etc. that it would be nice to start from a working example.
I’m surprised that brew install mitmproxy doesn’t create one.
I couldn’t even find an example in the source code.
I’m not expecting https://github.com/ansible/ansible/blob/devel/examples/ansible.cfg
but a working config file would be a nice touch.