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iter = {}
-- sortByKeys iterates over the table where the keys are in sort order
function iter.sortByKeys(arr, f)
local a = table.keys(arr)
table.sort(a, f)
local i = 0
return function()
i = i + 1
if a[i] ~= nil then
return a[i], arr[a[i]]
end
end
end
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