How to serialize struct with member datatype unsigned __int128 (using gcc)

[pghosh2]

I am encountering an error while trying to (de)serialize a struct containing data-structure of type unsigned __int128.

error: static assertion failed: cereal could not find any input serialization functions for the provided type and archive combination. 954 | static_assert(traits::detail::count_input_serializers<T, ArchiveType>::value != 0,

While using uint64_t it works fine and has the following signature:

struct MnodeInfo {
 uint64_t node;
 int prefix_id;
 
 MnodeInfo()=default;
 template<class Archive>
 void serialize(Archive & archive)
   {
   archive(node, prefix_id);
   }
 };

However changing uint64_t to unsigned __int128 results in the above compile-time error. Is there a workaround for this issue? Can cereal be used to (de)serialize non-POD datatypes?

For reference I am using cereal v1.3.0; gcc version 9.2.0. I have posted the same question on StackOverflow as well. Looking for any suggestions to resolve this issue.