[issue33597] Compact PyGC_Head

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Are you sure that all memory allocators align at least on 8 bytes (to give up 3 unused bits)? I don't know the answer, it's an open question.

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nosy: +vstinner

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<https://bugs.python.org/issue33597>
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