code: func (mh *MethodHandler) StatusCodes(codes ...int) *MethodHandler {
  	if mh.statusCodes == nil {
  		mh.statusCodes = make([]int, 0)
  	}
  	mh.statusCodes = append(mh.statusCodes, codes...)
  	return mh
  }
docs: // StatusCodes is a fluent builder to append additional HTTP status codes
  // for the given MethodHandler. It's primarily used to disamgiguate
  // input from the NewMethodHandler constructor