make _tkinter.Tcl_Obj immutable

Author: picnixz

Modules/_tkinter.c

@@ -906,11 +906,14 @@ static PyType_Slot PyTclObject_Type_slots[] = {
 };
 
 static PyType_Spec PyTclObject_Type_spec = {
-    "_tkinter.Tcl_Obj",
-    sizeof(PyTclObject),
-    0,
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
-    PyTclObject_Type_slots,
+    .name = "_tkinter.Tcl_Obj",
+    .basicsize = sizeof(PyTclObject),
+    .flags = (
+        Py_TPFLAGS_DEFAULT
+        | Py_TPFLAGS_DISALLOW_INSTANTIATION
+        | Py_TPFLAGS_IMMUTABLETYPE
+    ),
+    .slots = PyTclObject_Type_slots,
 };