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_PyCode_SetExtra() uses two memory block for code extras. By changing how memory is accessed and allocated, it would be possible to use a single memory block. Was it on purpose to use two memory blocks?
See for example PyTupleObject which uses a single memory block vs PyListObject which uses two memory blocks.
typedef struct {
 PyObject_VAR_HEAD
 PyObject *ob_item[1];
 /* ob_item contains space for 'ob_size' elements.
 * Items must normally not be NULL, except during construction when
 * the tuple is not yet visible outside the function that builds it.
 */
} PyTupleObject;