Regression: qtscxml doesn't compile, lacking asArrayIndex() and makeIdentifier() methods

/home/jarek/dev/qt-dev/qtscxml/src/scxml/qscxmlecmascriptdatamodel.cpp: In static member function ‘static void QScxmlEcmaScriptDataModelPrivate::setReadonlyProperty(QJSValue*, const QString&, const QJSValue&)’:
/home/jarek/dev/qt-dev/qtscxml/src/scxml/qscxmlecmascriptdatamodel.cpp:286:23: error: ‘struct QV4::String’ has no member named ‘asArrayIndex’; did you mean ‘toArrayIndex’?
         uint idx = s->asArrayIndex();
                       ^~~~~~~~~~~~
                       toArrayIndex
/home/jarek/dev/qt-dev/qtscxml/src/scxml/qscxmlecmascriptdatamodel.cpp:292:12: error: ‘struct QV4::String’ has no member named ‘makeIdentifier’
         s->makeIdentifier();
            ^~~~~~~~~~~~~~
/home/jarek/dev/qt-dev/qtscxml/src/scxml/qscxmlecmascriptdatamodel.cpp: In static member function ‘static QScxmlEcmaScriptDataModelPrivate::SetPropertyResult QScxmlEcmaScriptDataModelPrivate::setProperty(QJSValue*, const QString&, const QJSValue&)’:
/home/jarek/dev/qt-dev/qtscxml/src/scxml/qscxmlecmascriptdatamodel.cpp:320:23: error: ‘struct QV4::String’ has no member named ‘asArrayIndex’; did you mean ‘toArrayIndex’?
         uint idx = s->asArrayIndex();
                       ^~~~~~~~~~~~
                       toArrayIndex