Lua filters and possible error

[Apprentice Ship <tex.apprentice-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I am trying to understand a bit more about Lua filters, in particular
"spellcheck" in the repository.

   https://github.com/pandoc/lua-filters/tree/master/spellcheck

and my understanding is that the filters will act on the AST, but a
sequence of:

$ pandoc sample.md -s -o sample.tex

$ pandoc --lua-filter spellcheck.lua sample.md
summer
missspeling [en]

$ pandoc --lua-filter spellcheck.lua sample.tex
des
français
missspeling
english
sont
Ces
Mais

seems to show that the Pandoc (ver 3.1.9) is not understanding the
language metadata, as used by the LaTeX-writer. In fact, I do not see the
the main-language metadata entry under either of the commands:

     pandoc -t native sample.md
     pandoc -t native sample.tex

Is that what is going on here?

Joshua

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