Feature request: Passing TwiML instances to the twiml property

[dkundel]

As of recently the Voice API now supports passing a twiml argument to various functions such as client.calls.create. Right now this argument has to be a string but it would be great if you could pass a VoiceResponse instance directly without having to call toString(). Example:

const twilio = require('twilio');
const client = twilio();

const from = '...';
const to = '...';
const twiml = new twilio.twiml.VoiceResponse();
twiml.say('This is awesome');

client.calls.create({
  from, to, twiml
});

[childish-sambino]

This issue has been added to our internal backlog to be prioritized. Pull requests and +1s on the issue summary will help it move up the backlog (ref: DI-2440).