[issue33597] Compact PyGC_Head

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Are you sure that all memory allocators align at least on 8 bytes (to give up 3 unused bits)?

If they don't then a simple double array will end up unaligned.  It's not impossible but extremely unlikely.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33597>
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