Serhiy Storchaka added the comment:

I called the fix a workaround because other solution may be to make 
PyType_FromSpec() not setting tp_new in such cases. I expect that this is 
common mistake when convert a static class to a heap class with 
PyType_FromSpec(). At least we should add warnings in C API documentation and 
PEP 384. Or change the behavior of PyType_FromSpec() if it is appropriate. But 
this is different issue. If PyType_FromSpec() will be changed, proposed fix can 
be reverted.

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<http://bugs.python.org/issue23815>
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