refactor no need to sets of json

texta_mlp/document.py

-import json
 import math
 from typing import List, Optional
 
@@ -144,10 +143,8 @@ class Document:
     def remove_duplicate_facts(facts: List[dict]):
         if facts:
             facts = Document.handle_null_values_in_facts(facts)
-            set_of_jsons = {json.dumps(fact, sort_keys=True, ensure_ascii=False) for fact in facts}
-            without_duplicates = [json.loads(unique_fact) for unique_fact in set_of_jsons]
-            without_duplicates_ignored_keys = list(Document.remove_duplicates_with_ignored_keys(without_duplicates, ["id", "source"]))
-            return without_duplicates_ignored_keys
+            without_duplicates = list(Document.remove_duplicates_with_ignored_keys(facts, ["id", "source"]))
+            return without_duplicates
         else:
             return []