Hello!

I'm encountering yet another strange behavior of Commander.js.

When I add the following option:
command.option('--clean', 'cleans the destination build directory');

And then run my program this way: program, the Commander returns clean option as undefined.

However, when I add an additional negative option:

command.option(`--clean`, 'cleans the destination build directory');
command.option(`--no-clean`, 'prevents cleaning the destination directory');

It starts to return true for the clean option when executed the same as above instead of the undefined.

Why is that? I want the option to be always undefined if it's not specified via CLI.