Use new PyGC_Enable() and PyGC_Disable() functions in CPython 3.10 where we...

Use new PyGC_Enable() and PyGC_Disable() functions in CPython 3.10 where we need to temporarily disable the GC.

Cython/Utility/ExtensionTypes.c

@@ -72,8 +72,15 @@ static int __Pyx_PyType_Ready(PyTypeObject *t) {
     {
         // Make sure GC does not pick up our non-heap type as heap type with this hack!
         // For details, see https://github.com/cython/cython/issues/3603
-        PyObject *ret, *py_status;
         int gc_was_enabled;
+        #if PY_VERSION_HEX >= 0x030A00b1
+        // finally added in Py3.10 :)
+        gc_was_enabled = PyGC_Disable();
+        (void)__Pyx_PyObject_CallMethod0;
+
+        #else
+        // Call gc.disable() as a backwards compatible fallback, but only if needed.
+        PyObject *ret, *py_status;
         PyObject *gc = NULL;
         #if PY_VERSION_HEX >= 0x030700a1 && (!CYTHON_COMPILING_IN_PYPY || PYPY_VERSION_NUM+0 >= 0x07030400)
         // https://foss.heptapod.net/pypy/pypy/-/issues/3385
@@ -99,6 +106,7 @@ static int __Pyx_PyType_Ready(PyTypeObject *t) {
             Py_DECREF(gc);
             return -1;
         }
+        #endif
 
         // As of https://bugs.python.org/issue22079
         // PyType_Ready enforces that all bases of a non-heap type are
@@ -119,6 +127,9 @@ static int __Pyx_PyType_Ready(PyTypeObject *t) {
         t->tp_flags &= ~Py_TPFLAGS_HEAPTYPE;
 
         if (gc_was_enabled) {
+#if PY_VERSION_HEX >= 0x030A00b1
+            PyGC_Enable();
+#else
             PyObject *t, *v, *tb;
             PyErr_Fetch(&t, &v, &tb);
             ret = __Pyx_PyObject_CallMethod0(gc, PYUNICODE("enable"));
@@ -135,6 +146,7 @@ static int __Pyx_PyType_Ready(PyTypeObject *t) {
             }
         }
         Py_DECREF(gc);
+#endif
     }
 #endif