Request HTTP method defaults to empty string about laminas-diactoros HOT 8 CLOSED

//...
    protected static $validMethods = [
        'OPTIONS'  => true,
        'GET'      => true,
        'HEAD'     => true,
        'POST'     => true,
        'PUT'      => true,
        'DELETE'   => true,
        'TRACE'    => true,
        'CONNECT'  => true,
        'PATCH'    => true,
        'PROPFIND' => true,
    ];

    /**
     * Array of possible CSRF Header names
     * @var array
     */
    protected static $csrfHeaderNames = [
        'X-CSRF-Token',
        'X-CSRFToken',
        'X-XSRF-TOKEN',
    ];

    /**
     * Constructor
     * @param UriInterface $uri
     * @param string $method
     * @param array $headers
     * @param Stream|resource|string $body
     * @param string $protocolVersion
     * @throws InvalidArgumentExceptions
     */
    public function __construct(
        $uri = null,
        $method = 'GET',
        $headers = [],
        $body = 'php://temp',
        $protocolVersion = '1.1'
    ) {
        parent::__construct($protocolVersion, $headers, $body);

        $this->method = $this->filterMethod($method);

        // Initialize uri from constructor argument or build uri from request
        // environment
        if (null === $uri) {
            $this->uri = new Uri('');
        } else if (is_string($uri)) {
            $this->uri = new Uri($uri);
        } elseif($uri instanceof UriInterface) {
            $this->uri = $uri;
        } else {
            throw new InvalidArgumentException(
                'The constructor $uri must be a string, an instance of UriInterface or null'
            );
        }
    }
//...
    /**
     * Validate the HTTP method
     *
     * @param null|string $method
     * @throws InvalidArgumentException on invalid HTTP method.
     */
    protected function filterMethod($method)
    {
        if (null === $method) {
            return 'GET';
        }

        if (! is_string($method)) {
            throw new InvalidArgumentException(
                'The HTTP method must be a string'
            );
        }

        $method = strtoupper($method);

        if (! isset(static::$validMethods[$method])) {
            throw new InvalidArgumentException(sprintf(
                'Unsupported HTTP method "%s"',
                $method
            ));
        }

        return $method;
    }