[issue19692] Rename Py_SAFE_DOWNCAST

[Stefan Krah]

Stefan Krah <stefan at bytereef.org> added the comment:

Why would one not abort() in release mode? If the cast is inexact, the results will usually be so wrong that even on a web server a hard exit is preferable.

I don't think the check costs much time with branch prediction.

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nosy: +skrah

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<https://bugs.python.org/issue19692>
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