EF6 does not support enums

[alex-fomin]

I have a enum defined in PostgtreSQL as
CREATE TYPE NOTIFICATION_CHANNEL AS ENUM ('email', 'sms');
When I try to create query against this enum (smth. like dbContext.Notifications.Where(x=>x.Channel == NotificationChannel.Email))) i get cannot cast type notification_channel to integer

I have registered my enum as
NpgsqlConnection.GlobalTypeMapper.MapEnum<NotificationChannel>();
in my DbContext static constructor.

Does EF6 NpgSql support PGSQL enums?