Make betterproto.Casing no longer an Enum.

Gobot1234 · Gobot1234 · commit f0447183fb3d · 2022-06-16T14:50:24.000+01:00
I remember initially being confused as to how this ever worked as enum members to my knowledge were never callable, however, as it turns out Casing.CAMEL and SNAKE never actually were enum members
diff --git a/src/betterproto/__init__.py b/src/betterproto/__init__.py
@@ -32,7 +32,10 @@
 )
 
 from dateutil.parser import isoparse
-from typing_extensions import Final
+from typing_extensions import (
+    Final,
+    final,
+)
 
 from ._types import T
 from ._version import __version__
@@ -144,11 +147,14 @@ def datetime_default_gen() -> datetime:
 NAN: Final = "NaN"
 
 
-class Casing(enum.Enum):
+@final
+class Casing:
     """Casing constants for serialization."""
 
-    CAMEL = camel_case  #: A camelCase sterilization function.
-    SNAKE = snake_case  #: A snake_case sterilization function.
+    __slots__ = ()
+
+    CAMEL: Final = camel_case  #: A camelCase sterilization function.
+    SNAKE: Final = snake_case  #: A snake_case sterilization function.
 
 
 PLACEHOLDER: Final[Any] = object()
