anchor.diff:  
   ### Symbol Support
   
  -A new core predicate `cljs.core/js-symbol?` has been added 
  +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
   
  
positive.code: Iterator protocol. A new core predicate, `cljs.core/js-iterable?`
  is introduced with this feature.
  
  For example, `(js-iterable? (js/Set.))` is `true` and 
  
  [source,clojure]
  ----
  (-> (doto (js/Set.) (.add 1) (.add 2)) 
    seq)
  ----
  
  
negative.code: 
  `clj-nil` is no longer considered a numeric type, so, for example `(+ nil 1)` will warn
  
  Incorrect function with fixed arity of more params than variatic now causes a
  warning. For example:
  
  ----
  cljs.user=> (defn foo ([x] 1) ([& xs] 2))
  