Should we not use the EnumClass for enums so that we can exhaustive match?

[GP4cK]

I'm not sure it's even possible but I find it annoying that we can't do exhaustive match on enums because of the EnumClass in built_value.

google/built_value.dart#1315

[knaeckeKami]

Yes, me too.

there's already gql-dart/gql#297.

I think it might be possible to stop generating EnumClass classes and use normal enums instead, if we generate Serializers for the enums in gql_code_builder.