originalname meta with utf-8 symbols

This code

var Minio = require('minio')

var minioClient = new Minio.Client({
    endPoint: 'play.min.io',
    port: 9000,
    useSSL: true,
    accessKey: 'Q3AM3UQ867SPQQA43P2F',
    secretKey: 'zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG'
});

var meta = { originalname: 'тест.pdf' };

minioClient.putObject('test', 'test.pdf', Buffer.from(''), 0, meta)

throws error

_http_outgoing.js:464
    throw err;
    ^

TypeError [ERR_INVALID_CHAR]: Invalid character in header content ["x-amz-meta-originalname"]
    at ClientRequest.setHeader (_http_outgoing.js:473:3)
    at new ClientRequest (_http_client.js:194:14)
    at Object.request (https.js:289:10)
    at _makeRequest (C:\Projects\aclub-bpm\node_modules\minio\dist\main\minio.js:501:36)
    at DestroyableTransform.<anonymous> (C:\Projects\aclub-bpm\node_modules\minio\dist\main\minio.js:562:11)
    at DestroyableTransform.emit (events.js:203:15)
    at endReadableNT (C:\Projects\aclub-bpm\node_modules\readable-stream\lib\_stream_readable.js:1010:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)