Property alias on a javascript object points to different and corrupted object

import QtQuick 2.3
import QtTest 1.0

Item {
    QtObject {
        id: myObject
        property var item: Item {}
        property alias itemAlias : myObject.item

        property var jsObject: ({ myFunction: function(x,y) {} })
        property alias jsObjectAlias : myObject.jsObject
    }

    TestCase {

        function test_itemAlias() {
            // this works
            compare(myObject.itemAlias, myObject.item);
            compare(typeof(myObject.itemAlias.childAt), typeof(myObject.item.childAt));
        }

        function test_jsObjectAlias() {
            // the following comparison fails
            compare(myObject.jsObjectAlias, myObject.jsObject);
            // the following comparison also fails (actual: object; expected: function)
            compare(typeof(myObject.jsObjectAlias.myFunction), typeof(myObject.jsObject.myFunction));
        }

        function test_jsObjectAliasAssignment() {
            var myJsObject = { myOtherFunction: function(x,y) {} };
            myObject.jsObjectAlias = myJsObject;
            // the following comparisons fails
            compare(myObject.jsObject, myJsObject);
            compare(myObject.jsObjectAlias, myJsObject);
            // the following comparisons also fails (actual: object; expected: function)
            compare(typeof(myObject.jsObject.myOtherFunction), typeof(myJsObject.myOtherFunction));
            compare(typeof(myObject.jsObjectAlias.myOtherFunction), typeof(myJsObject.myOtherFunction));
        }
    }
}