Mark Shannon <m...@hotpy.org> added the comment:

Raymond,
When you say "this was mostly a net win" do you mean the more compact layout or 
ordering?

The compact layout is obviously a win, and doesn't conflict with sharing. The 
problem is that ordering conflicts with sharing.

As long as instances all have attributes that are a subset of the shared keys 
stored on the class, they can share attributes, or least they could in 3.5.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44772>
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