[issue19692] Rename Py_SAFE_DOWNCAST

[Martin v. Löwis]

Martin v. Löwis added the comment:

-1. The macro name doesn't claim the cast to be safe, i.e. it's not "Py_SAFELY_DOWNCAST", but "safe downcast", i.e. it's an assertion that the cast actually has been verified as being safe.

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nosy: +loewis

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19692>
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