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

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

Serhiy, do you think this should be a release blocker for the beta?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43916>
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