public function has(string $pathAndFilename, bool $allowSplitSource = false): bool
    {
        if ($allowSplitSource === true) {
            $pathsAndFileNames = glob($pathAndFilename . '.*.yaml');
            if ($pathsAndFileNames !== false) {
                foreach ($pathsAndFileNames as $pathAndFilename) {
                    if (is_file($pathAndFilename)) {
                        return true;
                    }
                }
            }
        }
        if (is_file($pathAndFilename . '.yaml')) {
            return true;
        }

        return false;
    }