Negation on at least some x86-ish systems also produces another kind of NaN, 
because the trivial negation implementation is a sign-bit flip.

This strikes me as similar to the endianness concerns of typed arrays, except 
probably far less harmful in practice.  I don't see what can reasonably be done 
about it, without effectively mandating attempting NaN-substitution whenever 
the value to set might be NaN.  But maybe someone smarter has ideas.

Jeff
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