i.e it's a Lua number -- a floating point.
So a kind of conversion can happen between a floating point and a sp
number (which has a limited range)
Of course Lua has its routines, but probably they differs from TeX
If I recall correctly, both use 32 bits, but if you extend to lets say
48 bit then the TeX routines are not good anymore.
Well, I'm not sure it's right, of course.
The lua numbers have enough precision to cast on the tex numbers (with
rounding) but in practice I don't care too much. As we have standardized
floats the behaviour is predictable. We could probably go completely
float at the tex end but too many datastructures expect an integer so
it's not worth the trouble.
Hans
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Hans Hagen | PRAGMA ADE
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| www.pragma-pod.nl
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