anchor.diff:  * align caption to match alignment of block image
   * make conum glyphs configurable in theme (use reference table to resolve)
   * CJK and/or multilingual support (see https://github.com/chloerei/asciidoctor-pdf-cjk)
  - ** document this in the README
   * description list term should keep together with content (file issue)
   * allow font properties to be set for lists (description_list, outline_list)
   * remove pdfmarks file after optimizing
  
positive.code: * FILE ISSUE: when split source listing, add top padding to bounding box (or is it the line metrics top?)
   ** perhaps this has to do with the a miscalculation in dry run when not starting from same y position?
   ** separate theme control for listing vs literal block (and maybe source too)
  * stroke and fill multi-page sidebar block (#259) and example block (#362)
  * support URL images in running content (need to delegate to resolve_image_path)
  * add feature to number bullets according to section number (needed for OpenDevise agreements)
  * outline should link to title page if there's a cover page (skip cover page and ensuing blank page)
  * don't allow title page content to jump to next page
  * might be better to organize fragments of source chunks by lines (and pass that around) to simplify post-processing
  
negative.code:  ** add broader character range to monospace font so we can drop fallback font by default (#282)
   ** consider having a fallback for prose and fallback for literal
  * should we drop "<font>" handler in formatted text transform?
  * FILE ISSUE: ttfunk 1.5.0 chokes on narrow no-break space char \u202f
  * implement text transform for running content (#702)
  * implement start line number in source listing (rouge) (#752)
   ** shouldn't this be fixed in core at the same time? (core #1742)
  * implement line highlighting in rouge (#681)
  * remove hack to add trailing endline to source for rouge
  * should we allow the template/format of the line number in the source listing to be controlled using a sprintf template?
  * only nest outline inside of root if doctype=article (still valid?)
  * warn if image in running content can't be found (#731)
   ** only report failure to embed image in running content once
  