anchor.diff:  
   == <symbol>! - Unsafe Operations
   
  -The Clojure style guide has this to say
  -
  -[]
  +https://github.com/bbatsov/clojure-style-guide#changing-state-fns-with-exclamation-mark[The Clojure style guide has this to say]:
  +
   ====
   The names of functions/macros that are not safe in STM transactions
   should end with an exclamation mark (e.g `reset!`).
  
positive.code: #='foo
  ;;=> 1
  ----
  
  []
  ====
  
negative.code: <<xref/../../reference/reader#tagged_literals,tagged literals>>
  Most commonly you'll see this use in https://github.com/edn-format/edn[EDN]
  (extensible data notation - a rich data fromat that can be used in Clojure)
  and in ClojureScript (`#js`). See  <<xref/../weird_characters#tagged_literals,`#inst`, `#uuid`, or `#js`>> for more info.
  
  * <<xref/../../reference/reader#tagged_literals,Clojure Documentation Reader>>
  * http://briancarper.net/blog/449/[Clojure Reader Macros]
  