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Ok... I think I can generate some noise too.

t = {
  "apples",
  "bananas",
  "apricots",
  apples_eaten = 4,
  bananas_eaten = 5,
  apricots_eaten =0
}
-- this traverses only the numeric indexes
-- makes use of one invisible implied default local variable '__i'
for t do 
  print(__i.." = "..t[__i])
end
-- should output:
--   1 = apples
--   2 = bananas
--   3 = apricots

-- this traverses only non numeric indexes
-- makes use of two invisible implied default local variables '__i' and '__v'
foreach t do
  print(__i.." = "..__v)
end
-- should output:
--   apples_eaten = 4
--   bananas_eaten = 5
--   apricots_eaten = 0

-- this traverses any indexes
-- makes use of one invisible implied default local variable '__i'
forany t do
  print(__i.." = "..t[__i])
end
-- should output:
--   1 = apples
--   2 = bananas
--   3 = apricots
--   apples_eaten = 4
--   bananas_eaten = 5
--   apricots_eaten = 0

Maybe it is a stupid concept, but I will just throw it in here...