[issue28959] Add a macro for dict size

[Raymond Hettinger]

Raymond Hettinger added the comment:

It looks like the struct of a dict is already arranged in a way that it could switch to PyObject_VAR_HEAD which would let you use Py_SIZE everywhere.

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28959>
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