Address review

Author: Fidget-Spinner

Misc/NEWS.d/next/Core_and_Builtins/2026-01-10-21-04-47.gh-issue-143667.MGlHeh.rst

@@ -1 +1 @@
-Specialize :opcode:`!FOR_ITER` for dictionary item iteration. In the JIT, this is optimized even further when code is unpacking the result to a pair.
+Specialize :opcode:`!FOR_ITER` for iteration over dictionary items. In the JIT, this is optimized even further when code is unpacking the result to a pair.

Objects/dictobject.c

@@ -5447,6 +5447,7 @@ dictiter_iternextitem_lock_held(PyDictObject *d, PyObject *self,
 int
 _PyDictIter_IterNextItemPair(PyObject *self, PyObject **key, PyObject **value)
 {
+    assert(Py_IS_TYPE(self, &PyDictIterItem_Type));
     _PyDictIterObject *di = (_PyDictIterObject *)self;
     PyDictObject *d = di->di_dict;