...

src/vm.h

@@ -1567,7 +1567,7 @@ inline void Dict::_probe(PyObject *key, bool &ok, int &i) const{
 inline void CodeObjectSerializer::write_object(VM *vm, PyObject *obj){
     buffer += 'o';
     PyObject* s = vm->py_repr(obj);
-    write_str(CAST(Str&, s));
+    buffer += CAST(Str&, s).str();
     buffer += END;
 }