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This is a bit OT.

I have a special NaN to represent a NIL value - see my other thread "Comparing userdata with other types". My experiments show that it gets preserved by the FPU operations:

In your experience, do you think I can count on that? (I'm only interested in 32/64-bit Windows).


Mike Pall wrote:
So there's no need to canonicalize NaNs after
every operation, which is an expensive step in your patch. The FPU
on its own only generates 0xfff80000_00000000. Canonicalization is
only needed for the two ingress points (lua_pushnumber and