Opaque

pub fn Opaque(comptime tag: Tag) type {
    return struct {
        bytes: []const u8,

        pub fn decodeDer(decoder: *der.Decoder) !@This() {
            const ele = try decoder.element(tag.toExpected());
            if (tag.constructed) decoder.index = ele.slice.end;
            return .{ .bytes = decoder.view(ele) };
        }

        pub fn encodeDer(self: @This(), encoder: *der.Encoder) !void {
            try encoder.tagBytes(tag, self.bytes);
        }
    };
}