I've figured out a workaround, but just wondering if there's a better way 
than diving into the metatables: 

~~~
function fix_table_strings(t)
  for k, v in pairs(t) do
    if type(v) == "table" then
      local metatable = getmetatable(v)
      if metatable ~= nil and metatable.__name == "Inlines" then
        t[k] = pandoc.utils.stringify(v)
      else
        fix_table_strings(t[k])
      end
    end
  end
end
~~~

On Tuesday, May 24, 2022 at 9:30:41 AM UTC+3 Shane Liesegang wrote:

> Is there a way to tell whether a given object is a pandoc.Inlines as 
> opposed to a plain Lua table? When I call `type(obj)` on it, it just 
> returns "table." I note that if I print it, it shows "Inlines:" instead of 
> "table:" but is there any smarter way to determine? 
>
> I see some code in the Lua filters example repository 
> <https://github.com/pandoc/lua-filters/blob/03c0fef0e56274ec9c958cdfe508a20618a1b623/scholarly-metadata/scholarly-metadata.lua#L45> 
> that does this kind of check, but I don't know if it's crucial to that code 
> or not, if something has changed recently, etc. 
>
> (My use case here is walking through my Meta object and building something 
> that will get passed to different functions -- if it encounters a nested 
> table of data, I need to recurse, but if it's an Inlines object, I want to 
> stringify it.) 
>
>

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