Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:

At least part of the problem has nothing to do with subclassing from int and 
instead is related to pickling objects with circular references.

I am attaching a patch that demonstrates the problem.  In 
issue1581183-test.diff, I modified memoize so that it does nothing rather than 
fails an assert if object is already in the memo.  This makes python and C 
implementations behave the same, but still fail to produce correct results. 
Pickling with protocol 2 break circular reference and instead creates two 
independent objects.

----------
assignee:  -> belopolsky
keywords: +patch
Added file: http://bugs.python.org/file17800/issue1581183-test.diff

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