🐛 Early return in case there's missing or extra keys

Author: JoaquimEsteves

mypy/messages.py

@@ -1614,13 +1614,14 @@ def unexpected_typeddict_keys(
             # Generate simpler messages for some common special cases.
             # Use list comprehension instead of set operations to preserve order.
             missing = [key for key in expected_keys if key not in actual_set]
-            self.fail(
-                "Missing {} for TypedDict {}".format(
-                    format_key_list(missing, short=True), format_type(typ)
-                ),
-                context,
-                code=codes.TYPEDDICT_ITEM,
-            )
+            if missing:
+                self.fail(
+                    "Missing {} for TypedDict {}".format(
+                        format_key_list(missing, short=True), format_type(typ)
+                    ),
+                    context,
+                    code=codes.TYPEDDICT_ITEM,
+                )
             extra = [key for key in actual_keys if key not in expected_set]
             if extra:
                 self.fail(
@@ -1630,6 +1631,8 @@ def unexpected_typeddict_keys(
                     context,
                     code=codes.TYPPEDICT_UNKNOWN_KEY,
                 )
+            if missing or extra:
+                # No need to check for further errors
                 return
         found = format_key_list(actual_keys, short=True)
         if not expected_keys: