fromEventPattern does not pass multiple arguments from event callbacks

[raycarter]

RxJS version:
5.5.2
Code to reproduce:

const EventEmitter = require('events').EventEmitter;
const Observable = require('rxjs').Observable;

const emitter = new EventEmitter();

const obs = Observable.fromEventPattern(function(handler) {
  emitter.on('test', handler);
});

obs.subscribe(args => {
  console.log(args); // 'a', expected ['a', 'b', 'c']
});

emitter.emit('test', 'a', 'b', 'c');

Expected behavior:
A group of arguments is expected in subscribe (here expected ['a', 'b', 'c']).
Actual behavior:
Only the first argument is emtted (here 'a').
Additional information:
I think it could be common to create Observables from events and a lot of events pass more than one arguments in its callback functions. It is useful to let rxjs collect all of the arguments and pass them to subscribe. If I am wrong here about how to use rxjs in this situation, please give me a hint how I should do it correctly or which other operators should be used for events with multiple arguments. Thanks a lot!

[kwonoj]

dupe of #2431.

[lock]

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