I don't think calling APIs like _PyDict_CheckConsistency() is super useful.  Can the PR find bugs like issue33803 quickly?

I think calling tp_traverse is better.


static int
check_object(PyObject *obj, void *unused)
{
    _PyObject_ASSERT(obj, Py_REFCNT(obj) > 0);
    return 0;
}

static void
gc_check_object(PyGC_Head *gc)
{
    PyObject *op = FROM_GC(gc);
    _PyObject_ASSERT(op, Py_REFCNT(obj) > 0);
    _PyObject_ASSERT(op, _PyObject_GC_IS_TRACKED(op));
    Py_Type(op)->tp_traverse(op, (visitproc)check_object, NULL);
}