anchor.diff:  
   === Choice
   
  -Perform an arbitrary choice between two or more observable sequences and return the
  +Performs an arbitrary choice between two or more observable sequences and returns the
   first value available from any provided observables.
   
  -This kind if combinator works very well with operations that can timeout:
  +This kind of combinator works very well with operations that can timeout:
   
   [source, clojure]
   ----
  
positive.code: ;; ==> on-end
  ----
  
  Skip while some condition evalutates to true:
  
  [source, clojure]
  ----
  
negative.code: 
  === Slice
  
  This is a combination of `skip` and `take`, and returns an observable
  sequence, that represents the portion between start and end of the source
  observable sequence.
  
  [source, clojure]
  