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David Given wrote:
> Therefore, casting (double)0xFFFFFFFF to an unsigned int is 
> valid, but it's
> *not* valid to cast it to an int. Casting it to an unsigned 
> int and *then* to an int is valid, and will result in 0xFFFFFFF.
> Anything else invoces undefined behaviour, and results in 
> daemons flying out of your nose.

lua_Integer is a typedef for ptrdiff_t, which must be signed. So for
safe extraction of unsigned integers in stock Lua there may be a need
for a lua_UnsignedInteger typedef, and a lua_tounsignedinteger function.
Maybe lua_Unsigned and lua_tounsigned would be clear enough.