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> tmp=0.1+0.2-0.3
> print(tmp)
> 5.5511151231258e-17

This is *not* a bug in Lua; it's inherent to the native
floating-point arithmetic that Lua uses. See
	http://lua-users.org/wiki/FloatingPoint
	http://docs.python.org/tut/node16.html