anchor.diff:  
     /**
     * @hint Adds an additional 'to' recipient to the CURRENT personalization envelope
  -  //TODO handle arrays?
     */
     public any function addTo( required any email ) {
       var count = countPersonalizations();
  
positive.code:   }
  
    /**
    * @hint Adds a NEW personalization envelope, with only the specified email address. The personalization can then be further customized with later commands
    //TODO handle arrays?
    */
    public any function to( required any email ) {
      addPersonalization(
  
negative.code: 
      setPersonalizations( [] );
      setContent( [] );
      setHeaders( {} );
  
      if ( arguments.keyExists( 'from' ) )
        this.from( from );
  