docs: function applyDefaultValuesForOptionsArguments( options, def ) {
      Object.keys( options ).forEach( function ( cmdName ) {
          const
              cmdOpts = options[ cmdName ],
              defOpts = def[ cmdName ].opts;
          if ( defOpts ) {
              Object.keys( defOpts ).forEach( function ( defOptName ) {
                  if ( cmdOpts[ defOptName ] ) return;
                  const defOptValue = defOpts[ defOptName ];
                  if ( countArgs( defOptValue ) > 0 ) {
                      cmdOpts[ defOptName ] = defOptValue.args;
                  }
              } );
          }
      } );
  }