[QUESTION] Handling default values?

[robations]

I'm wondering what is the expected way to handle arguments or options that are not supplied.

To give one example, I have an option which should be true by default:

const knownOpts = {headers: [Boolean]};

And this would be commonly used in the cmd line as --no-headers. In the current scheme I will either have:

parsed.headers = undefined // falsy, but want it to be true
or
parsed.headers = false // definitely falsy

At the moment it feels like nopt creates an incomplete model of my options and I then have to pass to another function to normalise all incomplete values. Perhaps this is either a feature request or out of scope.