cast

pynamodb/connection/base.py

@@ -357,7 +357,7 @@ def _make_api_call(self, operation_name: str, operation_kwargs: Dict) -> Dict:
                         CancellationReason(
                             code=d['Code'],
                             message=d.get('Message'),
-                            item=d.get('Item'),
+                            item=cast(Optional[Dict[str, Dict[str, Any]]], d.get('Item')),
                         ) if d['Code'] != 'None' else None
                     )
                     for d in cancellation_reasons