Would you consider to pass the info of the top-level-division in the JSON?

When reading:

--top-level-division=[default|section|chapter|part]

: Treat top-level headers as the given division type in LaTeX, ConTeXt, 
DocBook, and TEI output. The hierarchy order is part, chapter, then 
section; all headers are shifted such that the top-level header becomes the 
specified type. The default behavior is to determine the best division type 
via heuristics: unless other conditions apply, section is chosen. When the 
LaTeX document class is set to report, book, or memoir (unless the article 
option is specified), chapter is implied as the setting for this option. If 
beamer is the output format, specifying either chapter or part will cause 
top-level headers to become \part{..}, while second-level headers remain as 
their default type.

I found that requiring the user to specify the top-level-division in YAML 
for filters (in addition to the cli option they need) is not enough, 
because of the default option. Users might want to leave it as default, and 
it means filters author need to replicate the logic to determine which one 
becomes the default.

By the way, I don’t understand the last few words of this quote: second-level 
headers remain as their default type, what are their default type?

On Thursday, December 15, 2016 at 5:10:30 AM UTC-8, John MacFarlane wrote:

There's no way to get this information in a filter; it's 
> part of the WriterOptions. 
>
> +++ Kolen Cheung [Dec 15 16 02:54 ]: 
> >Is it possible to determine the 
> `--top-level-division=[default|section|chapter|part]` option used in a 
> filter? I want to write a filter that needs to know how the header-level-1 
> is related to the LaTeX's top level division. 
> > 
> >I tried using such settings with `-t native -s` and it seems the info 
> isn't there. 
> > 
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