INADA Naoki added the comment:
This issue is caused by dictresize() and _PyObjectDict_SetItem()
1. a.__dict__.pop('a') convert the dict to combined table which has double
keysize.
2. a.a = 1 converts the dict to split table again if there are no instances
sharing key with class.
As I wrote before, pop, popitem, and del should not increase key size.
And _PyObjectDict_SetItem shouldn't convert the dict to split-table when the
dict doesn't share keys
with the class before calling PyDict_SetItem.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28147>
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