Fix a couple of bugs exposed by the new __index__ code. The 64-bit buildbots
were failing due to inappropriate clipping of numbers larger than 2**31
with new-style classes. (typeobject.c) In reviewing the code for classic
classes, there were 2 problems. Any negative value return could be returned.
Always return -1 if there was an error. Also make the checks similar
with the new-style classes. I believe this is correct for 32 and 64 bit
boxes, including Windows64.
Add a test of classic classes too.
diff --git a/Misc/NEWS b/Misc/NEWS
index 49de4b6..f81389d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,12 @@
Core and builtins
-----------------
+- Fix bug related to __len__ functions using values > 2**32 on 64-bit machines
+ with new-style classes.
+
+- Fix bug related to __len__ functions returning negative values with
+ classic classes.
+
- Patch #1538606, Fix __index__() clipping. There were some problems
discovered with the API and how integers that didn't fit into Py_ssize_t
were handled. This patch attempts to provide enough alternatives