The documentation for QStringList says that:

QStringList inherits from QList<QString>.

But as of Qt 6 this is not correct, it is now an alias of QList<QString>: https://www.qt.io/blog/qlist-changes-in-qt-6. It should probably say something like the documentation of QByteArrayList:

QByteArrayList is actually just a QList<QByteArray>. It is documented as a full class just for simplicity of documenting the member methods that exist only in QList<QByteArray>.