fix: rely on get_type_hints to grab CatchAll field (#490)

dataclasses_json/undefined.py

@@ -2,8 +2,9 @@
 import dataclasses
 import functools
 import inspect
+import sys
 from dataclasses import Field, fields
-from typing import Any, Callable, Dict, Optional, Tuple, Union, Type
+from typing import Any, Callable, Dict, Optional, Tuple, Union, Type, get_type_hints
 from enum import Enum
 
 from marshmallow.exceptions import ValidationError  # type: ignore
@@ -246,8 +247,10 @@ def _catch_all_init(self, *args, **kwargs):
 
     @staticmethod
     def _get_catch_all_field(cls) -> Field:
+        cls_globals = vars(sys.modules[cls.__module__])
+        types = get_type_hints(cls, globalns=cls_globals)
         catch_all_fields = list(
-            filter(lambda f: f.type == Optional[CatchAllVar], fields(cls)))
+            filter(lambda f: types[f.name] == Optional[CatchAllVar], fields(cls)))
         number_of_catch_all_fields = len(catch_all_fields)
         if number_of_catch_all_fields == 0:
             raise UndefinedParameterError(