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

[Pablo Galindo Salgado]

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

> Pablo, I've made a patch for most of these (I've left out Christian's modules). I've only added a couple of tests for now. Do you want all in one PR?

Yes, please. The second most important part here is also adding regression tests so this doesn't happen. These tests should also be added when new types are converted in the future.

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