Popup's modal documentation is too brief

https://doc.qt.io/qt-5/qml-qtquick-controls2-popup.html#modal-prop says:

This property holds whether the popup is modal. The default value is false.

It had me questioning what a modal popup was, because I'd set it to true on a Dialog, but was still able to close it by clicking outside of it. It was only after setting closePolicy: Popup.CloseOnEscape that it behaved as expected. The expected behaviour (for me) is what widgets does:

#include <QApplication>
#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget widget;
    widget.resize(400, 400);

    QDialog *d = new QDialog(&widget);
    d->setModal(true);

    widget.show();

    d->exec();

    return app.exec();
}