[TIMOB-11660] iOS: String.format crash with no feedback if the arguments are not strings

var win = Ti.UI.createWindow({
	title:'test',
	backgroundColor:'white',
});

var cost = 10;
var coins = 20;
var message = String.format(L("menu_iconsbuy"),cost,coins);

// setting cost and coins as Strings, it works
// var message = String.format(L("menu_iconsbuy"),cost.toString(),coins.toString());

Ti.API.info('#### ' + message);

win.open();

<?xml version="1.0" encoding="UTF-8"?>
<!-- All localized strings should go here -->
<resources>
	<string name="menu_iconsbuy">This icon set will cost %1$s coins.\n You have %2$s coins\nWant to buy it ?</string>
</resources>