When using qint8 in a struct that is passed via D-Bus then it will fail due to it treating it as an int and thinking is being redefined as signed char

When using qint8 in a struct that is passed via D-Bus then it will fail due to it treating it as an int and thinking is being redefined as signed char. With the example attached, after starting the server and the client it will output:

QDBusMarshaller: type `signed char' attempts to redefine basic D-BUS type 'i' (int) (Did you forget to call beginStructure()