anchor.diff:        this.emails,
         this.phones,
         this.postalAddresses,
  -      this.avatar});
  +        this.avatar,
  +        this.note});
   
     String identifier,
         displayName,
  
positive.code:       "emails": emails,
        "phones": phones,
        "postalAddresses": postalAddresses,
        "avatar": contact.avatar
      };
    }
  
  
negative.code: 
  import 'package:collection/collection.dart';
  import 'package:flutter/services.dart';
  
  class ContactsService {
    static const MethodChannel _channel =
  