Leaks in QQmlInstantiator

import QtQuick 2.4

Item {

    Instantiator {//this is just a jitter, for create and delete the target Instantiator
        id: inst
        delegate: Instantiator {//this is target, there is leak after target destroyed
            model: 1
            Item {}
        }
    }

    Timer {
        interval: 1
        repeat: true
        running: true
        onTriggered: {
            if(inst.model) inst.model = 0
            else inst.model = 1000
        }
    }
}