anchor.diff:    void setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]);
   
     /**
  -   * Removes the elements in the range [start]..[end] (excluding).
  +   * Removes the elements in the range [start] to [end] exclusive.
      *
      * It is an error if [start]..[end] is not a valid range pointing into the
      * `this`.
  
positive.code:   void removeRange(int start, int end);
  
    /**
     * Sets the elements in the range [start]..[end] (excluding) to the given
     * [fillValue].
     *
     * It is an error if [start]..[end] is not a valid range pointing into the
  
negative.code:   void fillRange(int start, int end, [E fillValue]);
  
    /**
     * Removes the elements in the range [start] to [end] exclusive and replaces
     * them with the contents of the [iterable].
     *
     * It is an error if [start]..[end] is not a valid range pointing into the
  