absl.flags._argument_parser: Mark EnumClassSerializer as generic.

rchen152 · copybara-github · commit 2af184bfcdaa · 2024-01-11T13:11:29.000-08:00
PiperOrigin-RevId: 597635180
diff --git a/absl/flags/_argument_parser.py b/absl/flags/_argument_parser.py
@@ -504,7 +504,7 @@ def serialize(self, value: List[Text]) -> Text:
     return str(serialized_value)
 
 
-class EnumClassSerializer(ArgumentSerializer):
+class EnumClassSerializer(ArgumentSerializer[_ET]):
   """Class for generating string representations of an enum class flag value."""
 
   def __init__(self, lowercase: bool) -> None:
