[issue11134] Add missing type slots

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

My understanding is that Martin can add, but not subtract.  Martin, is that correct?  At this point, I'm not sure we know that the limited API is sufficient.

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nosy: +rhettinger

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<http://bugs.python.org/issue11134>
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