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Javier wrote:

on a related issue: in LTN9, there's the advice not to
build big strings by accumulation, instead it uses a stack
and merges it down in a binary algorithm.

i ask: what about building an array with table.insert()
and get the final string with table.concat()?  isn't that
faster/easier?

Yes, table.concat is an implementation of LTN9.

Say, Lua Technical Note maintainers -- is there a reason why
LTN12

 <http://lua-users.org/wiki/FiltersSourcesAndSinks>

is not on

 <http://www.lua.org/notes/>

the Lua Technical Notes page?

--
Aaron