Passing multiple options to lua-filter from CLI

["Clément Aubert" <aubert.clement-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi, 

This question relates to 
https://github.com/jgm/pandoc/issues/2104#issuecomment-595983954
There is a lua filter containing

``` lua
function add_default_code_class(el)
  if #(el.classes) == 0 then
    el.classes = default_code_classes
    return el
  end
end

function get_default_code_class(meta)
  if meta['default-code-class'] then
    default_code_classes = 
{pandoc.utils.stringify(meta['default-code-class'])}
  end
end
```

and I'm trying to tweak it so that two classes can be passed from the 
command-line, eg. using 

--lua-filter default-code-class.lua -M default-code-class=c, numberLines

but can't find a way.

Thanks!
Clément.

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