Fix bug

openapi_python_client/parser/properties/model_property.py

@@ -1,5 +1,5 @@
 from itertools import chain
-from typing import ClassVar, Dict, List, NamedTuple, Optional, Set, Tuple, Union
+from typing import ClassVar, Dict, List, NamedTuple, Optional, Set, Tuple, Union, cast
 
 import attr
 
@@ -69,8 +69,12 @@ def _is_subtype(first: Property, second: Property) -> bool:
         [
             _is_string_enum(first) and isinstance(second, StringProperty),
             _is_int_enum(first) and isinstance(second, IntProperty),
-            _is_string_enum(first) and _is_string_enum(second) and values_are_subset(first, second),
-            _is_int_enum(first) and _is_int_enum(second) and values_are_subset(first, second),
+            _is_string_enum(first) and _is_string_enum(second)
+            # cast because MyPy fails to deduce type
+            and values_are_subset(cast(EnumProperty, first), cast(EnumProperty, second)),
+            _is_int_enum(first) and _is_int_enum(second)
+            # cast because MyPy fails to deduce type
+            and values_are_subset(cast(EnumProperty, first), cast(EnumProperty, second)),
         ]
     )