I think these are ok

src/capi/typeobject.cpp

@@ -873,7 +873,6 @@ static PyObject* call_attribute(PyObject* self, PyObject* attr, PyObject* name)
 template <ExceptionStyle S, Rewritable rewritable>
 Box* slotTpGetattrHookInternal(Box* self, BoxedString* name, GetattrRewriteArgs* rewrite_args, bool for_call,
                                Box** bind_obj_out, RewriterVar** r_bind_obj_out) noexcept(S == CAPI) {
-    assert(0 && "check refcounting");
     if (rewritable == NOT_REWRITABLE) {
         assert(!rewrite_args);
         rewrite_args = NULL;

src/runtime/objmodel.cpp

@@ -5452,7 +5452,7 @@ Box* compareInternal(Box* lhs, Box* rhs, int op_type, CompareRewriteArgs* rewrit
     Box* rrtn = callattrInternal1<CXX, NOT_REWRITABLE>(rhs, rop_name, CLASS_ONLY, NULL, ArgPassSpec(1), lhs);
     if (rrtn != NULL && rrtn != NotImplemented)
         return rrtn;
-    Py_DECREF(rrtn);
+    Py_XDECREF(rrtn); // in case it is NotImplemented
 
     static BoxedString* cmp_str = getStaticString("__cmp__");
     lrtn = callattrInternal1<CXX, NOT_REWRITABLE>(lhs, cmp_str, CLASS_ONLY, NULL, ArgPassSpec(1), rhs);

src/runtime/types.cpp

@@ -616,7 +616,6 @@ static Box* typeTppCall(Box* self, CallRewriteArgs* rewrite_args, ArgPassSpec ar
 
 static Box* typeCallInternal(BoxedFunctionBase* f, CallRewriteArgs* rewrite_args, ArgPassSpec argspec, Box* arg1,
                              Box* arg2, Box* arg3, Box** args, const std::vector<BoxedString*>* keyword_names) {
-    assert(0 && "check refcounting");
     if (rewrite_args)
         assert(rewrite_args->func_guarded);