Collecting dead strings

["Research" <research@...>]

Hi,
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
end

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?

Thanks,
Brett