How can I output a UTF-8 CSV that Excel will read properly? #132

$_csvEncoding= 'UTF-8';
        $_dataEncoding = 'UTF-8';
        $_newline = "\r\n";
        $_eol = "\r\n";
        $_bom = true;
        $timestamp = time();
        $this->response = $this->response->withDownload('test-'.$timestamp.'.csv');
        $this->set(compact('data', '_dataEncoding' ,'_csvEncoding', '_newline', '_eol', '_bom'));
        $this->viewBuilder()
        ->setClassName('CsvView.Csv')
        ->setOptions([
            'serialize' => 'data',
            'header' => $header,
'extract' => $extract,
]);