First-class QVariant/QMetaType support for QStringView, QByteArrayView, QAnyStringView

As the subject says: there's first-class support for QString/QByteArray, but not for the respective view classes.

QStringView view;
QVariant v = view; // error
QVariant v2 = QVariant::fromValue(view); // error

constexpr auto id = qMetaTypeId<QStringView>(); // error

The above works with QString/QByteArray.

Also, did something change in Qt 6 wrt queued connections? I would've said that without QMetaType support, a connection forced queued would have failed to compile, but apparently instead works fine.