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Right now output returns a string to its callback, this means you can't just write it to a file or send it to a response as the default encoding (utf8) is incorrect. You have to manually specify binary. If instead of a string you return a binary buffer then you don't have to worry about this. I also fixed the generation of the final string to not build the string with repeated concatenation which is O(n^2) and instead build up an array of strings then join them all at once which is O(n)