code: def nested_option(default=False):
      
  
      def decorator(method):
          @wraps(method)
          def wrapper(*args, **kwargs):
              option = Option.nested.value
              kwargs[option] = kwargs.get(option, bool(default))
              return method(*args, **kwargs)
  
          return wrapper
  
      return decorator
docs: Attaches the option ``nested`` with its *default* value to the
      keyword arguments when the option does not exist. All positional
      arguments and keyword arguments are forwarded unchanged.