fix: revert encodedFieldName renaming

Author: O-Hannonen

json_serializable/lib/src/decode_helper.dart

@@ -153,7 +153,7 @@ mixin DecodeHelper implements HelperCore {
     final discriminator = config.unionDiscriminator;
 
     String buildSingleImpl(ClassElement impl) {
-      final unionName = encodedName(config.unionRename, impl.name!);
+      final unionName = encodedFieldName(config.unionRename, impl.name!);
 
       return "'$unionName' => ${classPrefix(impl)}FromJson(json),";
     }

json_serializable/lib/src/encoder_helper.dart

@@ -147,7 +147,7 @@ mixin EncodeHelper implements HelperCore {
     String buildSingleImpl(ClassElement impl) {
       final originalName = impl.name!;
 
-      final unionName = encodedName(config.unionRename, originalName);
+      final unionName = encodedFieldName(config.unionRename, originalName);
 
       return '''
   final $originalName instance => {

json_serializable/lib/src/enum_utils.dart

@@ -125,7 +125,7 @@ Object? _generateEntry({
         );
       }
     } else {
-      return encodedName(jsonEnum.fieldRename, field.name!);
+      return encodedFieldName(jsonEnum.fieldRename, field.name!);
     }
   } else {
     final reader = ConstantReader(annotation);

json_serializable/lib/src/json_key_utils.dart

@@ -335,7 +335,7 @@ KeyConfig _populateJsonKey(
       disallowNullValue,
       classAnnotation.includeIfNull,
     ),
-    name: name ?? encodedName(classAnnotation.fieldRename, element.name!),
+    name: name ?? encodedFieldName(classAnnotation.fieldRename, element.name!),
     readValueFunctionName: readValueFunctionName,
     required: required ?? false,
     unknownEnumValue: unknownEnumValue,

json_serializable/lib/src/utils.dart

@@ -258,7 +258,7 @@ extension DartTypeExtension on DartType {
 String ifNullOrElse(String test, String ifNull, String ifNotNull) =>
     '$test == null ? $ifNull : $ifNotNull';
 
-String encodedName(FieldRename fieldRename, String declaredName) =>
+String encodedFieldName(FieldRename fieldRename, String declaredName) =>
     switch (fieldRename) {
       FieldRename.none => declaredName,
       FieldRename.snake => declaredName.snake,