anchor.diff:  3+|[#key-prefix-toc-dot-leader]*Key Prefix:* <<key-prefix-toc-dot-leader,toc_dot_leader>>
   
   |content
  -|Quoted string +
  +|<<quoted-string,Quoted string>> +
   (default: '. ')
   |toc:
     dot_leader:
  
positive.code:   - Color as hex string (e.g., #ffffff)
    - Image path
    - Enumerated type (where specified)
  * Null (clears any previously assigned value)
    - _empty_ (i.e., no value specified)
    - null
  
negative.code:     columns: <25% =50% >25%
  
  |<side>_<position>_content^[3,4]^
  |<<quoted-string,Quoted string>>
  |header:
    recto:
      left:
  