Custom enumeration not supported by qt's signal system

When working with enum of custom size, the qt signal / slot system seems not to be able to convert it correctly to *int* type.
This bug only seems to appear when dealing with enum that are less than 4 bytes. 

I attached a sample project that register a simple C++ class containing an *std::uint16_t* enum. The Qml code will not receive undefined value, but rather random values.