code: public function refusing(string $method) : RouteBuilder
      {
          $method = strtoupper($method);
          $this->methods = array_diff($this->methods, [$method]);
  
          return $this;
      }
docs: Removes given method(s) from the set of methods the
  route should handle.
  
  @param string $method The HTTP method(s) the route should no longer handle
  @return RouteBuilder