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> > There should not be hidden assumptions. BTW, Lua 5.2 has the NaN trick
> > implemented (on top of these macros).
> 
> Cool, did not see that. Why was it removed in 5.3?

It does not work for 64-bit integers, 64-bit machines, or 32-bit
machines using Small Lua (with single-precision floats).

-- Roberto