Fix wrong type for parameter (#5127)

JensHeinrich · web-flow · commit 18408648a416 · 2023-03-01T13:01:24.000+01:00
Co-authored-by: JensHeinrich &lt;github.com/JensHeinrich&gt;
diff --git a/pydantic/class_validators.py b/pydantic/class_validators.py
@@ -55,7 +55,7 @@ def validator(
     each_item: bool = False,
     always: bool = False,
     check_fields: bool = True,
-    whole: bool = None,
+    whole: Optional[bool] = None,
     allow_reuse: bool = False,
 ) -> Callable[[AnyCallable], 'AnyClassMethod']:
     """
