Default value of Menu's closePolicy differs from the description in docs and conflicts with onPressAndHold events

import QtQuick 2.8
import QtQuick.Window 2.2
import QtQuick.Controls 2.2

Window {
    visible: true
    width: 640
    height: 480

    Menu {
        id: menu
        MenuItem {  text: "Menu Item" }
        Component.onCompleted: console.log("menu closePolicy:", closePolicy)

        // Setting closePolicy to not include Popup.CloseOnReleaseOutside fixes
        // the problem with menu being closed prematurely on mouse release.

        // closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside
    }

    Popup {  Component.onCompleted: console.log("popup closePolicy:", closePolicy)  }

    ListView {
        anchors.right: parent.right
        model: 3
        width: 100
        height: 300

        delegate: ItemDelegate {
            text: "item" + index
            background: Rectangle { border.width: 1 }

            MouseArea {
                id: mouseArea
                anchors.fill: parent

                signal clickedCustom(int button)
                signal pressAndHoldCustom(int button)

                onPressAndHoldCustom: menu.open()

                Timer {
                    id: timer
                    interval: 700
                    onTriggered:
                        mouseArea.pressAndHoldCustom(mouseArea.pressedButtons)
                }

                onPressed: timer.restart()
                onReleased: if (timer.running) {
                                timer.stop()
                                clickedCustom(mouse.button)
                            }
            }
        }
    }
}

// Output
// qml: popup closePolicy: 17
// qml: menu closePolicy: 21