Hello everybody out there using Pandoc,

The following Lua (used with RMarkdown in RStudio) filter should put "*Figure 
n.*" in bold at the beginning of every figure caption, but it doesn't 
change my output:

function Image (img)
  if FORMAT:match 'docx' then
    caption = pandoc.utils.stringify(img.caption)
    if (string.find(caption, 'Fig') ~= nil) then
      img.caption[1] = pandoc.Strong(img.caption[1])
      img.caption[3] = pandoc.Str(string.gsub(img.caption[3].text, ":", 
"."))
      img.caption[3] = pandoc.Strong(img.caption[3])
      fig_num_string = 
string.sub(pandoc.utils.stringify(img.caption[3]),1,2)
      fig_num = math.floor(tonumber(fig_num_string))
      if (fig_num > 6) then
        img.caption[3] = pandoc.Strong("S" .. tostring(8-fig_num) .. '.')
      end
      img.caption.long = pandoc.Strong('A')
      img.caption = pandoc.Strong('A')
    end
  end
  print(pandoc.utils.stringify(img.caption.long))
  return img
end

By putting print statements, I can partially verify that the filter 
operates on the correct elements, but it doesn't change the output.

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