[issue29221] ABC Recursion Error on isinstance() with less than recursion limit class hierarchy depth

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


Added file: http://bugs.python.org/file46251/cache_example.py

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29221>
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