let observable28: Stream<number | string, void> =  Kefir.sequentially(100, [0, 1, 2, 3]).withHandler<number | string, void>((emitter: Emitter<string | number, void>, event: Event<number>) => {
		if (event.type === 'end') {
			emitter.emit('bye');
			emitter.end();
		}
		if (event.type === 'value') {
			for (var i = 0; i < event.value; i++) {
				emitter.emit(event.value);
			}
		}
	});

 private emit(level: Level, msg: string) {
   this.emitter.value({ type: 'LOG', payload: { level, msg } });
 }