slot with complex template default value is not compile able

Moc parsing looks broken for this:

public slots:
void doSomething(QHash<QString, QVariant> values = QHash<QString, QVariant>());

>>

case 0: doSomething((*reinterpret_cast< QHash<QString,QVariant>>(_a[1])),(*reinterpret_cast< QVariant>(_a[2]))); break;

compile error for the attached project:
debug\moc_testobject.cpp(73) : error C2660: 'TestObject::doSomething' : function does not take 2 arguments