For clarity, change _longobject to build directly from PyObject_VAR_HEAD
instead of faking it by hand. It *is* a var object, and nothing but
hysterical raisins to pretend it's an oddball.
diff --git a/Include/longintrepr.h b/Include/longintrepr.h
index 89ba586..abf8640 100644
--- a/Include/longintrepr.h
+++ b/Include/longintrepr.h
@@ -36,11 +36,14 @@
digit) is never zero. Also, in all cases, for all valid i,
0 <= ob_digit[i] <= MASK.
The allocation function takes care of allocating extra memory
- so that ob_digit[0] ... ob_digit[abs(ob_size)-1] are actually available. */
+ so that ob_digit[0] ... ob_digit[abs(ob_size)-1] are actually available.
+
+ CAUTION: Generic code manipulating subtypes of PyVarObject has to
+ aware that longs abuse ob_size's sign bit.
+*/
struct _longobject {
- PyObject_HEAD
- int ob_size;
+ PyObject_VAR_HEAD
digit ob_digit[1];
};