Missing QVariant/QMetaType API to specify type of QDBusArgument

# from PyQt6.QtCore import QVariant, QMetaType
# from PyQt6.QtWidgets import QApplication
# from PyQt6.QtDBus import QDBusInterface, QDBusConnection, QDBus, QDBusMessage, QDBusArgument

from PySide6.QtWidgets import QApplication
from PySide6.QtDBus import QDBusInterface, QDBusConnection, QDBus, QDBusMessage

SERVICE = "org.freedesktop.Notifications"
PATH = "/org/freedesktop/Notifications"
INTERFACE = SERVICE

app = QApplication([])
bus = QDBusConnection.sessionBus()
iface = QDBusInterface(SERVICE, PATH, INTERFACE, bus)
assert iface.isValid(), iface.lastError()

def _as_uint32(x):
    # variant = QVariant(x)
    # successful = variant.convert(QMetaType(QMetaType.Type.UInt.value))
    # assert successful
    # return variant
    return x


def _as_qstringlist(x):
    # return QDBusArgument(x, QMetaType.Type.QStringList.value)
    return x


reply = iface.callWithArgumentList(
    QDBus.CallMode.Block,
    "Notify",
    [
        "test",  # app name
        _as_uint32(0),  # replaces_id
        "",  # icon filename
        "title",
        "body",
        _as_qstringlist([]),  # actions
        {},  # hints
        -1,  # timeout
    ]
)
assert reply.type() != QDBusMessage.MessageType.ErrorMessage, reply.errorMessage()
print(reply.arguments())

AssertionError: Type of message, “(sisssasa{sv}i)”, does not match expected type “(susssasa{sv}i)”