anchor.diff:  Iterator protocol. A new core predicate, `cljs.core/js-iterable?`
   is introduced with this feature.
   
  -For example, `(js-iterable? (js/Set.))` is `true` and 
  +For example, `(js-iterable? (js/Set.))` is `true` and
   
   [source,clojure]
   ----
  -(-> (doto (js/Set.) (.add 1) (.add 2)) 
  +(-> (doto (js/Set.) (.add 1) (.add 2))
     seq)
   ----
   
  
positive.code: 
  ### Symbol Support
  
  A new core predicate `cljs.core/js-symbol?` has been added 
  and printing has been revised to allow printing of symbols:
  
  ----
  cljs.user=> (js/Symbol "abc")
  #object[Symbol(abc)]
  ----
  
  ## More Flexable Build Support
  
  * `:bundle-cmd`
  * `:target-fn`
  * A new `--install-deps` CLI option
  * several new helper methods and facilities have
  been added to the compiler API.
  
  ## Warning Improvements
  
  
negative.code: 
  ifdef::env-github,env-browser[:outfilesuffix: .adoc]
  
  We're happy to announce a new release of ClojureScript. If you're an existing
  user of ClojureScript please read over the following notes carefully. There are
  two very significant changes. First, ClojureScript now ships with greatly
  enhanced support for integration with popular JavaScript bundling tools such as
  Webpack and Metro. Second, due to changes to Google Closure Compiler and
  Library, we've decided to drop support for the Rhino and Nashorn REPLs.
  
  ## Noteworthy Changes
  
  * Closure Compiler has been updated to `v20200112`
  * Closure Library has been updated to `0.0-20191016-6ae1f72f`
  * Rhino, Nashorn, and GraalJS REPLs have been removed
  
  The latest Closure Compiler & Library releases included a number of breaking
  changes which significantly increased the maintenance burden for this release.
  Given Closure Compiler & Library's recent pace of change, we've decided to
  focus our energies on the essential browser and Node.js REPLs and enrichen the
  CLI & REPL APIs to ease third party implementations targeting other JavaScript
  environments.
  
  ## New Core Features
  
  ## JavaScript Bundler Support
  
  * `:target :bundle`
  * `:bundle-cmd`
  * `:target-fn`
  * A new `--install-deps` CLI option
  
  We're happy to announce a significant new feature - the `:bundle` target. This
  target generates output that can be fed directly into popular JavaScript
  bundlers such as Webpack and Metro (for React Native). Not only does this
  greatly ease usage of Node modules, library creators can now distribute
  ClojureScript artifacts that depend on Node modules and be confident that users
  can consume these artifacts regardless of which build tool they may prefer.
  
  There's much more to say about the `:bundle` targetl, and we'll be releasing a
  separate post and guide soon.
  
  ### Iterator Support
  
  