Message should be a subclass of IProtoMessage

Author: abn

src/betterproto/__init__.py

@@ -24,6 +24,8 @@
 
 import typing
 
+from grpclib._typing import IProtoMessage  # noqa
+
 from ._types import T
 from .casing import camel_case, safe_snake_case, snake_case
 from .grpc.grpclib_client import ServiceStub
@@ -497,7 +499,7 @@ def _get_cls_by_field(cls, fields):
         return field_cls
 
 
-class Message(ABC):
+class Message(IProtoMessage):
     """
     A protobuf message base class. Generated code will inherit from this and
     register the message fields which get used by the serializers and parsers