QSignalSpy warns about enumeration type method parameters that were registered using Q_ENUM

qtbase/tests/auto/corelib/itemmodels/qitemmodel produces a ton of warnings

Don't know how to handle 'hint', use qRegisterMetaType to register it.

when constructing a QSignalSpy

   QSignalSpy modelLayoutChangedSpy(currentModel, &QAbstractItemModel::layoutChanged);

at qtbase/tests/auto/corelib/itemmodels/qitemmodel/tst_qitemmodel.cpp:849 . They refer to the parameter QAbstractItemModel::LayoutChangeHint which has a Q_ENUM:

   enum LayoutChangeHint
    {
        NoLayoutChangeHint,
        VerticalSortHint,
        HorizontalSortHint
    };
    Q_ENUM(LayoutChangeHint)

which supposedly registers the meta type automagically?