anchor.diff:    @$dart$core.override
     Iterable map(Callable collecting)
       =>  Iterable.$map(this, collecting);
  +
  +  @$dart$core.override
  +  Iterable flatMap(Callable collecting)
  +    =>  Iterable.$flatMap(this, collecting);
   
     @$dart$core.override
     $dart$core.bool contains([$dart$core.Object element])
  
positive.code: 
    Float power([Float other]) => new Float($dart$math.pow(this._value, other._value));
  
    // Comparable
    Comparison compare([Float other])
        =>  _value < other._value ? smaller : (_value > other._value ? larger : equal);
  
negative.code:     =>  Iterable.$map(this, collecting);
  
    @$dart$core.override
    Iterable flatMap(Callable collecting)
      =>  Iterable.$flatMap(this, collecting);
  
    @$dart$core.override
    Iterable get rest
      =>  Iterable.$rest(this);
  
  