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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