Georg Brandl <ge...@python.org> added the comment:

> My first thought is "Why is the reference counter stored with the object 
> itself?"

Because if you move the reference counter out of the object, you a) add another 
indirection and b) depending on how you implement it require a certain amount 
of memory more per object.

It's far from obvious that the possible benefits are worth this, and needs to 
be tested carefully, which nobody has done yet.

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nosy: +georg.brandl

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<http://bugs.python.org/issue9942>
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