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Small example of how the #Lua subsystem can be used to query #pandoc's capabilities:
The default binary allows to `--list-extensions` of a given format, but there is no analogous option to list all formats which work with a given extension, so here is a pandoc Lua program that provides this functionality: https://gist.github.com/tarleb/ef63974ab18d92acf0eb40180d832c48