[Regression] Crash when appending to ListModel

import QtQuick 2.0

Item {
    width: 400; height: 400

    ListModel { id: listModel }

    Component.onCompleted: {
        // crashes in 5.2 (in 5.1 there is no crash, but also no way to access the sub-elements of 'ids')
        listModel.append( { description: "fruit", "ids": [ "7937", "1247", "0543"] } )
        listModel.append( { description: "veggies", "ids": [ "9378", "2234", "0987" ] } )
    }
}