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> Has anyone already tried to compile Lua with lua_Number defined as the
> "long double" C data type?

These changes in luaconf.h seem to work fine with "make ansi".

#define LUA_NUMBER	long double
#define LUA_NUMBER_SCAN		"%Lf"
#define LUA_NUMBER_FMT		"%.14Lg"

I've used ansi to avoid the integer conversion tricks, which are specific to
doubles, I guess.