[issue43916] Check that new heap types cannot be created uninitialised

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Alternatively we can make PyType_FromSpec() setting tp_new to NULL if there is explicit {Py_tp_new, NULL} in slots.

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<https://bugs.python.org/issue43916>
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