Inconsistent behavior of flick() at bounds

import QtQuick 2.0

ListView {
    width: 400
    height: 400

    focus: true
    Keys.onUpPressed: flick(0,2000)

    highlightRangeMode: ListView.StrictlyEnforceRange
    preferredHighlightBegin: 0
    preferredHighlightEnd: 0

    model: 10
    delegate: Item {
        width: parent.width
        height: 50

        Text {
            anchors.centerIn: parent
            text: index
        }
    }
}