Opaque containers do not work with QML

When you pass an opaque container from Python to QML, QML sees it as a PyObject, not as its native Qt type. The attached example results in the following printed to the console:

<PySide6.QtGui.QPointFList object at 0x0000020A25EEEDB0> [PySide6.QtCore.QPointF(1.000000, 2.000000)]
qml: QVariant(PySide::PyObjectWrapper, 0x20a25eeedb0) 

It would be useful if QML saw it as a QList, to make passing data from Python to QML more efficient.