Create a value type with Freezed

[BenjiFarquhar]

Is this class a value type? How would I make it become one if not? I want to assign a value from it without it changing when the original changes. I thought maybe copyWith would have that purpose; however, it is still changing when the original changes when I do this:

var x = vgnItmCache!.copyWith();

The class in question:

part 'vegan_item_cache.freezed.dart';
part 'vegan_item_cache.g.dart';

@freezed
class VgnItmCache extends Entity with LocalSave<VgnItmCache>, _$VgnItmCache {
  const factory VgnItmCache(
      {Map<VgnItmType, VgnItmEst>? vgnItms,
      @Default(<ImageStorageCommand>[])
          List<ImageStorageCommand> imageStorageCommands,
      VgnItmType? vgnItmType,
      FormType? formType,
      @JsonKey(ignore: true)
          Ref? provider}) = _VgnItmCache;

  factory VgnItmCache.fromJson(Map<String, dynamic> json) =>
      _$VgnItmCacheFromJson(json);

  const VgnItmCache._();

  Future<List<ImagePickerImage>?> executeImageCommands(
      List<ImagePickerImage> existingImages) async {
    if (imageStorageCommands.isNotEmpty) {
      for (final command in imageStorageCommands) {
        if (command is S3AddImageCommand) {
          final image = await command.execute();
          existingImages.add(image!);
        } else if (command is S3DeleteImageCommand) {
          final image = await command.execute();
          existingImages
              .removeWhere((theImage) => theImage.fileName == image?.fileName);
        }
      }
    }

    existingImages.removeWhere(
        (theImage) => theImage.fileName == null || theImage.url == null);

    return existingImages;
  }

  @override
  VgnItmCacheRepository repository(Ref ref) {
    return ref.read(vgnItmsRepositoryProvider);
  }

  void setVgnItm(VgnItm vgnItm) {
    vgnItms![vgnItm.type] = vgnItms![vgnItm.type]!.copyWith(vgnItm: vgnItm);
  }

  void setVgnItmEst(VgnItmEst vgnItm) {
    vgnItms![vgnItm.vgnItm!.type] = vgnItm;
  }
}