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I need to know how to properly destroy my lua code when it's no longer needed in my game engine.

If I have:

function f29d8()
   -- some code

foo = f29d8
fooTable = t29d8
t29d8.scriptFunction = f29d8

Is setting f29d8 = nil and t29d8 = nil good enough to cause foo and fooTable to be garbage collected if I call lua_setgcthreshold(L, 0)?

Or do I need to explicitly set each reference to nil too?