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> So, can anybody weigh in on this? Is this a bug? If not, why not?

It is not a bug. On IEEE 754 hardware, you can have "numbers" x that do not
satisfy x==x:

% lua51
Lua 5.1.1  Copyright (C) 1994-2006, PUC-Rio
> x=math.log(-1)
> =x
> = x==x

What compiler are you using?