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> Seems like globals are traversed first, so using a global table this problem
> can happen in the main thread.
> t = {}
> t["no" .. "ref1"] = 1
> t["no" .. "ref2"] = 2
> for k, v in pairs(t) do
>     t[k] = nil
>     print(k, v)
>     collectgarbage("collect")
> end

The coroutine-based version seems more stable. This example does not
seem to work (that is, does not "not work" :-) when inserted inside a
larger test file, with many other globals. I guess it depends on the
order that items are visited in the global table. Inside threads (using
local variables), the order is more predictable.

-- Roberto