[issue33803] contextvars: hamt_alloc() must initialize h_root and h_count fields

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> In bpo-38392, I modified PyObject_GC_Track() in debug mode to detect this bug.

Awesome!!!

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<https://bugs.python.org/issue33803>
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