anchor.diff:    ConvertData? get deserializeConvertData => _pairFromContext.fromJson;
   
     late final _pairFromContext = _ConvertPair(fieldElement);
  +
  +  TypeHelperCtx._(this._helperCore, this.fieldElement);
   
     @override
     void addMember(String memberContent) {
  
positive.code: import 'utils.dart';
  
  TypeHelperCtx typeHelperContext(
          HelperCore helperCore, FieldElement fieldElement) =>
      TypeHelperCtx._(helperCore, fieldElement);
  
  class TypeHelperCtx
  
negative.code:   @override
    ClassConfig get config => _helperCore.config;
  
    @override
    ConvertData? get serializeConvertData => _pairFromContext.toJson;
  
  