[Rd] Benefit of treating NA and NaN differently for numerics

From: Saptarshi Guha <saptarshi.guha_at_gmail.com>
Date: Thu, 31 Dec 2009 15:43:43 -0500

I notice in main/arithmetic.c, that NA and NaN are encoded differently(since every numeric NA comes from R_NaReal which is defined via ValueOfNA)
. What is the benefit of treating these two differently? Why can't NA be a synonym for NaN?

Thank you


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