diff --git a/Include/cpython/object.h b/Include/cpython/object.h
@@ -231,6 +231,7 @@ struct _typeobject {
 * by code other than the specializer and interpreter. */
struct _specialization_cache {
    PyObject *getitem;
};

/* The *real* layout of a type object when allocated on the heap */

diff --git a/Include/internal/pycore_code.h b/Include/internal/pycore_code.h
@@ -119,6 +119,8 @@ struct callable_cache {
    PyObject *len;
    PyObject *list_append;
    PyObject *object__getattribute__;
};

/* "Locals plus" for a code object is the set of locals + cell vars +

diff --git a/Include/internal/pycore_frame.h b/Include/internal/pycore_frame.h
@@ -95,9 +95,27 @@ static inline void _PyFrame_StackPush(_PyInterpreterFrame *f, PyObject *value) {

void _PyFrame_Copy(_PyInterpreterFrame *src, _PyInterpreterFrame *dest);

/* Consumes reference to func and locals */
static inline void
-_PyFrame_InitializeSpecials(
    _PyInterpreterFrame *frame, PyFunctionObject *func,
    PyObject *locals, PyCodeObject *code)
{
@@ -213,7 +231,20 @@ _PyFrame_PushUnchecked(PyThreadState *tstate, PyFunctionObject *func)
    _PyInterpreterFrame *new_frame = (_PyInterpreterFrame *)tstate->datastack_top;
    tstate->datastack_top += code->co_framesize;
    assert(tstate->datastack_top < tstate->datastack_limit);
-    _PyFrame_InitializeSpecials(new_frame, func, NULL, code);
    return new_frame;
}


diff --git a/Include/internal/pycore_object.h b/Include/internal/pycore_object.h
@@ -300,8 +300,10 @@ static inline int _PyType_SUPPORTS_WEAKREFS(PyTypeObject *type) {
}

extern PyObject* _PyType_AllocNoTrack(PyTypeObject *type, Py_ssize_t nitems);

extern int _PyObject_InitializeDict(PyObject *obj);
extern int _PyObject_StoreInstanceAttribute(PyObject *obj, PyDictValues *values,
                                          PyObject *name, PyObject *value);
PyObject * _PyObject_GetInstanceAttribute(PyObject *obj, PyDictValues *values,

diff --git a/Include/internal/pycore_opcode.h b/Include/internal/pycore_opcode.h