Overriding property change signals causes a crash

import QtQuick 2.0

Item {

    property int a: 10
    onAChanged: console.log("onAChanged")

    // either of the following two lines causes the issue
    signal aChanged()
    //function aChanged() { console.log("aChanged"); }

    // note that automatic emission now fails also
    Component.onCompleted: {
        a = 20
    }

    // you need a certain number of properties to trigger the issue
    property int b
    property int c
    property int d
    property int e
    property int f
    property int g
    property int h
    property int i
    property int j
    property int k
    property int l
}