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

[Raymond Hettinger]

Raymond Hettinger added the comment:

Not sure if this is related, but I have a simple Cache class that gets a recursion error at a depth of about 166 calls (a sixth of the expected 1000).  I suspect that the reason is the many of the steps individually add to the recursion depth causing the recursion limit to be reached at some integer multiple faster than would be expected.

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nosy: +rhettinger

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<http://bugs.python.org/issue29221>
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