anchor.diff:  }'
   --------------------------------------------------
   
  -We can also add a tag to the list of tags (note, if the tag exists, it
  +We can add a tag to the list of tags (note, if the tag exists, it
   will still add it, since its a list):
   
   [source,js]
  
positive.code: }'
  --------------------------------------------------
  
  And, we can delete the doc if the tags contain blue, or ignore (noop):
  
  [source,js]
  --------------------------------------------------
  
negative.code: [[upserts]]
  [float]
  === Upserts
  
  If the document does not already exist, the contents of the `upsert` element
  will be inserted as a new document.  If the document does exist, then the
  `script` will be executed instead:
  
  [source,js]
  --------------------------------------------------
  