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Object/object.c:  You're right, my suggestion would leak v.
 I originally was going to tell you to just call
PyErr_BadInternalCall(), but that is not what
PyObject_String() does.  It's so messy to add a flag. :-(  I
don't see any other way at the moment.  Can you think of any
cleaner solution?

Objects/unicodeobject.c: yuck. I didn't notice the
shadowing.  You're right the outer v does need a DECREF. 
Please rename the inner v to avoid shadowing.

Objects/longobject.c: Oh, I see it now.  I would prefer the
checks for a == NULL (and b == NULL) to be immediately after
they are set from long_invert.  There's no reason to defer
the check/failure is there?

Thanks!