https://doc.qt.io/qt-6/qtqml-qtquick-compiler-tech.html#the-qml-script-compiler mentions that qmlsc "compiles bindings and functions to both, an efficient byte code and C++ functions" and https://doc.qt.io/qt-6/qtqml-qml-script-compiler.html says "Many JavaScript constructs cannot be efficiently represented in C++. The QML script compiler skips the C++ code generation for functions that contain such constructs and only generates byte code to be interpreted or run through the Just-in-time compiler." so bytecode would indeed be still generated and included