Update structseq and whatsnew

Author: eduardo-elizondo

Doc/whatsnew/3.8.rst

@@ -347,6 +347,20 @@ Build and C API Changes
 
   (Contributed by Antoine Pitrou in :issue:`32430`.)
 
+* Heap-allocated Types will now incref through :c:func:`PyObject_Init` (and
+  its parallel macro PyObject_INIT) instead of :c:func:`PyType_GenericAlloc`.
+
+  All instance allocation C APIs that call
+  :c:func:`PyObject_Init` will incref the Type accordingly. This
+  includes: :c:func:`PyObject_New`, :c:func:`PyObject_NewVar`,
+  :c:func:`PyObject_GC_New`, :c:func:`PyObject_GC_NewVar`, and all their
+  corresponding macros.
+
+  To prevent leaks tp_dealloc has be updated to decref the Type if it's not
+  already doing so.
+
+  (Contributed by Eddie Elizondo in :issue:`35810`.)
+
 
 Deprecated
 ==========

Modules/_curses_panel.c

@@ -250,8 +250,10 @@ PyCursesPanel_New(PANEL *pan, PyCursesWindowObject *wo)
 static void
 PyCursesPanel_Dealloc(PyCursesPanelObject *po)
 {
-    PyObject *tp = (PyObject *) Py_TYPE(po);
-    PyObject *obj = (PyObject *) panel_userptr(po->pan);
+    PyObject *tp, *obj;
+
+    tp = (PyObject *) Py_TYPE(po);
+    obj = (PyObject *) panel_userptr(po->pan);
     if (obj) {
         (void)set_panel_userptr(po->pan, NULL);
         Py_DECREF(obj);

Objects/structseq.c

@@ -62,12 +62,17 @@ static void
 structseq_dealloc(PyStructSequence *obj)
 {
     Py_ssize_t i, size;
+    PyTypeObject *tp;
 
+    tp = (PyTypeObject *) Py_TYPE(obj);
     size = REAL_SIZE(obj);
     for (i = 0; i < size; ++i) {
         Py_XDECREF(obj->ob_item[i]);
     }
     PyObject_GC_Del(obj);
+    if (PyType_GetFlags(tp) & Py_TPFLAGS_HEAPTYPE) {
+        Py_DECREF(tp);
+    }
 }
 
 /*[clinic input]