Hash collision security issue

Include/object.h

 #ifndef Py_OBJECT_H
 #define Py_OBJECT_H
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 
 /* Object and type object interface */
 
 /*
@@ skipping 454 matching lines @@
 PyAPI_FUNC(PyObject *) PyObject_Dir(PyObject *);
 
 
 /* Helpers for printing recursive container types */
 PyAPI_FUNC(int) Py_ReprEnter(PyObject *);
 PyAPI_FUNC(void) Py_ReprLeave(PyObject *);
 
 /* Helpers for hash functions */
 PyAPI_FUNC(long) _Py_HashDouble(double);
 PyAPI_FUNC(long) _Py_HashPointer(void*);
+
+typedef struct {
+    long prefix;
+    long suffix;
+} _Py_HashSecret_t;
+PyAPI_DATA(_Py_HashSecret_t) _Py_HashSecret;
 
 /* Helper for passing objects to printf and the like */
 #define PyObject_REPR(obj) _PyUnicode_AsString(PyObject_Repr(obj))
 
 /* Flag bits for printing: */
 #define Py_PRINT_RAW    1       /* No string quotes etc. */
 
 /*
 `Type flags (tp_flags)
 
@@ skipping 380 matching lines @@
         if (_PyTrash_delete_later && _PyTrash_delete_nesting <= 0) \
             _PyTrash_destroy_chain(); \
     } \
     else \
         _PyTrash_deposit_object((PyObject*)op);
 
 #ifdef __cplusplus
 }
 #endif
 #endif /* !Py_OBJECT_H */