A highly efficient bubble sort algorithm in Lua

bubblesort.lua

function print_array(a)
  local i = 1
  while a[i] do
    print(a[i])
    i = i + 1
  end
end

function bubblesort(t)
  local swapsMade;
  repeat
    swapsMade = false
    for i=1,#t-1 do
      -- print(t[i] .. "  " .. t[i+1])
      local a, b = t[i], t[i+1]
      if a > b then
        t[i], t[i+1] = b, a
        swapsMade = true
      end
    end
  -- break if no swaps were made
  until swapsMade == false
  return t;
end

local a = { 8, -3, 9, 4, 24, 2, -100, 12, 1 }
local sorted = bubblesort(a)
print_array(sorted);