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Mon Aug 29 18:28:10 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-August/145935.html

On 2016-08-29 23:38, Brett Cannon wrote:
> That means we still want to find a solution to attach arbitrary data to
> code objects without sacrificing performance. One proposal is what's in
> PEP 523 for the extra field. Another option is to make the memory
> allocator for code objects pluggable and introduce a new flag that
> signals that the object was created using a non-default allocator.
> Obviously we prefer the former solution due to its simplicity. :)

May I remind you that you can have the field with no extra memory cost?
:) The struct has sub-par alignments.

Christian

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[Python-Dev] Update on PEP 523 and adding a co_extra field to code objects