fakosmal:  just for your notice, no idea if weill help in 
```
QtMetaTypePrivate::checkMetaTypeFlagOrPointer<void (*)(QtPrivate::QMetaTypeInterface const*, void*)> (
    iface=0x7ffff36a0cc0 <QtPrivate::QMetaTypeInterfaceWrapper<QColor>::metaType>, ptr=0x0, Flag=QMetaType::NeedsDestruction
```
iface->flags is 7