Proto3 Optional Scalar Values

opts.proto

message Double {
    oneof value {
        None none = 1;
        double some = 2;
    }
}
message Float {
    oneof value {
        None none = 1;
        float some = 2;
    }
}
message Int32 {
    oneof value {
        None none = 1;
        int32 some = 2;
    }
}
message Int64 {
    oneof value {
        None none = 1;
        int64 some = 2;
    }
}
message Uint32 {
    oneof value {
        None none = 1;
        uint32 some = 2;
    }
}
message Uint64 {
    oneof value {
        None none = 1;
        uint64 some = 2;
    }
}
message Sint32 {
    oneof value {
        None none = 1;
        sint32 some = 2;
    }
}
message Sint64 {
    oneof value {
        None none = 1;
        sint64 some = 2;
    }
}
message Fixed32 {
    oneof value {
        None none = 1;
        fixed32 some = 2;
    }
}
message Fixed64 {
    oneof value {
        None none = 1;
        fixed64 some = 2;
    }
}
message Sfixed32 {
    oneof value {
        None none = 1;
        sfixed32 some = 2;
    }
}
message Sfixed64 {
    oneof value {
        None none = 1;
        sfixed64 some = 2;
    }
}
message Bool {
    oneof value {
        None none = 1;
        bool some = 2;
    }
}
message String {
    oneof value {
        None none = 1;
        string some = 2;
    }
}
message Bytes {
    oneof value {
        None none = 1;
        bytes some = 2;
    }
}

enum None {
    none = 0;
}