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> I thought upvaluejoin can only join upvalues. How can it be used to
> break the link?

function breaklink (f, upidx)
  local a
  local function dummy () return a end
  debug.upvaluejoin(f, upidx, dummy, 1)

The call 'breaklink(f,n)' will make the n-th upvalue from 'f' point to
a fresh upvalue (refering to variable 'a'), not shared with any other

-- Roberto