[issue33607] [subinterpreters] Explicitly track object ownership (and allocator).

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Rather than tracking this per object, you could potentially track it per arena at the memory allocator level instead. Then if you really need the info (e.g. when running the debug allocator), you can check it in a reliable way, but in the normal case, you assume the associations are being managed correctly and avoid any significant bookkeeping overhead.

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<https://bugs.python.org/issue33607>
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