fix: serializer

src/helpers/serialize.ts

@@ -17,10 +17,14 @@ export const serialize = <T>(
     | Document[],
   serializer: new () => T
 ): T | T[] => {
+  if (!serializable) return serializable as T | T[];
+
   // If the serializable object is a Document, convert it to a JSON object.
   if (serializable.hasOwnProperty("toJSON"))
     serializable = (serializable as Document).toJSON();
 
+  serializable = JSON.parse(JSON.stringify(serializable));
+
   // If the serializable object is an array, serialize each item in the array.
   if (Array.isArray(serializable)) {
     return serializable.map((item) => serialize(item, serializer)) as T[];