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-- Joins an array into text separated by separator
function join(arr, sep)
    if #arr == 0 then return "" end
    local res = arr[1]
    for i = 2,#arr do
        res = res .. sep .. arr[i]
    return res

    Why do you use this instead of table.concat? Since strings are
immutable, this code can use a lot of memory, as explained in PiL.

Sloppy reading of the documentation. I somehow missed table.concat. I'll make a new release tomorrow that fixes this and any other problems that are found until then.

Overall, markdown.lua is pretty slow as parsers go. It makes a lot of passes over the source file, substituting different things in each pass. ( works the same way.)

// Niklas