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I'm aware that, when using 'next', "The order in which the indices are enumerated is not specified".

But my question is:
- Is that order always the same, given the following conditions?

t = {
  a = { x=1, y=2 },
  b = { x=3, y=4 }

for k,v in next, t do
  -- don't change k (of course)
  -- don't change v
  -- may change v.x, v.y
  -- may add new fields to v

Given those assumptions, is the order of traversal of t always the same in different invocations of this loop (either b,a or a,b in this case) or is this not guaranteed?