anchor.diff:    @observable bool isActive;
     @observable String initials;
     @observable String streetAddress;
  +  @observable String serviceAccountName;
   
     String rev;
  -  @observable String serviceAccountName;
   
     Map _json = {};
     Project(String this.id);
  
positive.code:       'jobNumber': (jobNumber is double && jobNumber.isNaN) ? null : jobNumber,
        'initials': initials,
        'streetAddress': streetAddress,
        'type': 'project'
      };
      if (committed) {
  
negative.code:     jobNumber = values['jobNumber'];
      initials = values['initials'];
      streetAddress = values['streetAddress'];
      serviceAccountName = values['account'];
      assert(values['_id'] == null || values['_id'] == id);
      rev = values['_rev'];
    }
  