OSX: GeoPositionInfo has wrong values when the attribute isn't available

On OSX with corelocation plugin GeoPositionInfo will give wrong values for the attributes that aren't available.
For example when using wifi positioning QGeoPositionInfo::Direction and QGeoPositionInfo::GroundSpeed will give -1 instead of nan.

Values from corelocation plugin:

QGeoPositionInfo::Direction:          -1
QGeoPositionInfo::GroundSpeed:        -1
QGeoPositionInfo::VerticalSpeed:      nan
QGeoPositionInfo::MagneticVariation:  nan
QGeoPositionInfo::HorizontalAccuracy: 65
QGeoPositionInfo::VerticalAccuracy:   80.25