Martin v. Löwis added the comment:
Christian: I don't see why 24 bytes overhead sounds strange. GC_Head is
typedef union _gc_head {
struct {
union _gc_head *gc_next;
union _gc_head *gc_prev;
Py_ssize_t gc_refs;
} gc;
double dummy; /* force worst-case alignment */
} PyGC_Head;
which happens to be 3*8=24 bytes on a 64-bit system.
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<http://bugs.python.org/issue22193>
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