Regression: large increase in RAM usage for object literals that use numbers as keys

import QtQuick 2.0

Item {
    width: 400; height: 400

    Component {
        id: myObj
        QtObject {
            property variant myProp: { "3000": "yes", "8000": "no"}
            property variant myProp2: { "3000": "yes", "8000": "no"}
            property variant myProp3: { "3000": "yes", "8000": "no"}
            property variant myProp4: { "3000": "yes", "8000": "no"}
            property variant myProp5: { "3000": "yes", "8000": "no"}
            property variant myProp6: { "3000": "yes", "8000": "no"}
            property variant myProp7: { "3000": "yes", "8000": "no"}
            property variant myProp8: { "3000": "yes", "8000": "no"}
            property variant myProp9: { "3000": "yes", "8000": "no"}
            property variant myProp10: { "3000": "yes", "8000": "no"}

            property variant myTmpProp
            property variant key: "3000"

            Component.onCompleted: {
                for (var i = 0; i < 50; ++i) {
                    myTmpProp = myProp [key]
                }
            }
        }
    }

    Timer {
        interval: 16
        repeat: true
        running: true
        onTriggered: {
            myObj.createObject()
        }
    }

    Timer {
        interval: 1000
        repeat: true
        running: true
        onTriggered: {
            gc()
        }
    }
}