Bug in GFile.replace_contents_async

replace_contents_async_bug.js

const ByteArray = imports.byteArray;
const Gio = imports.gi.Gio;
const Lang = imports.lang;
const Mainloop = imports.mainloop;

let byteArray = ByteArray.fromString('lala');;
let file = Gio.file_new_for_path("output.json");
file.replace_contents_async(byteArray, null, false, Gio.FileCreateFlags.REPLACE_DESTINATION, null, 
	Lang.bind(this, function() {
		log("bye!");
	}));

Mainloop.run();