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> i made serialization function that can write out table with
> cross-references and (wow!) functions with (wow!) upvalues.

I could not make it run. Does it support *shared* upvalues as in the
program below? I mean, does it serialize f,g, and h correctly?

	local x=0
	function f() x=x+1 return end
	function g() x=x-1 return end

function h()
	assert(f(g()) == g(f()))