[issue29864] Misuse of Py_SIZE in dict.fromkey()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Yes, I treat this as a bugfix but I hesitated about backporting it. Py_SIZE works "by accident" and we can't change the layout of PyDictObject structure in maintain branches.

I have backported the fix to 3.6, but not to other branches since PyDict_GET_SIZE was added in 3.6 and other branches would need modifying the patch.

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<http://bugs.python.org/issue29864>
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