This makes it difficult to use BroadcastChannel to set up coordinations between worker threads unless they share the same supervisor. 

Which is problematic for things like caching or telemetry.


MessageEvent {
  type: 'message',
  defaultPrevented: false,
  cancelable: false,
  timeStamp: 444.018666
}

ports, source are empty strings.

        const util = require('util');
	const channel = new BroadcastChannel('example');

	if (isMainThread) {
		channel.addEventListener('message', evt => {
			console.log(util.inspect(evt)); // breakpoint here
		});
	} else {
		channel.postMessage('hello');
        }