code: protected function argument(\ReflectionParameter $parameter)
      {
          try {
              $argument = $parameter->getDefaultValue();
          } catch (\ReflectionException $exception) {
              $class = $parameter->getClass();
  
              $exists = $parameter->getClass() !== null;
  
              $name = $exists ? $class->getName() : $parameter->getName();
  
              $argument = $this->value($name);
          }
  
          return $argument;
      }
docs: Returns an argument based on the given parameter.
  
  @param  \ReflectionParameter $parameter
  @return mixed|null