bpo-30570: fix an issubclass infinite recursion crash #29017
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values code emits for `__bases__`.
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While this appears to work, I'd like to see the python benchmark suite run with it to make sure it doesn't have a notable performance impact. there are faster implementation alternatives. even just storing the visited pointers in a linear C array that we realloc when it needs to grow and doing a linear search in that or keeping it sorted for faster than O(n) lookup would be sufficient and waay less complex than using the PySet code. |
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needs backport to 3.10
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#29048 is much simpler and nicer than this one. closing. :) |
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issubclass()could crash due to infinite recursion on the values user supplied code emits for__bases__.https://bugs.python.org/issue30570