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

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland <erlend.aasland at innova.no>:


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keywords: +patch
Added file: https://bugs.python.org/file49989/patch.diff

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