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Unfortunately those modules seem unmaintained now, their docs are also gone.

> On 13 Jul 2018, at 00:34, Dirk Laurie <> wrote:
> I use the 'xml' luarock which depends on the 'lub' rock.
> I like it very much, but found that 'xml.dump' becomes very
> slow when the XML string is very long.
> I traced the reason to its use of the function 'lub.join'. This
> function concatenates a list by repeatedly concatenating
> the next element to the partial result, an algorithm that takes
> O(n²) time, where n is the length of the final result.
> Applications (such as 'xml') that do not need __concat
> metamethods do not need that algorithm.
>    require"lub".join = table.concat
> solves all the speed problems.
> -- Dirk