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No single error handling method is good enough for ALL the projects – which in turn leads to segmentation, with some of the projects using exceptions, and some others using error codes

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Right above I said that I like the std::error exception proposal a.k.a.[P0709R0]. However, as soon as I look at competing proposals, I begin to love it.

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We decide which set of types we’re using (fundamental or int*_t), and use it consistently

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The only thing we’re doing here, is changing the name of the type, NOT its behavior

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Allocator-based serialization for (Re)Actors is extremely fast (for x64 – around tens of ms per 100MB of state)

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Per-(Re)Actor allocators can be implemented without any changes within (Re)Actor itself (i.e. all the necessary changes can be confined to Infrastructure Code).

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with std::reduce() such code, while it compiles at least under MSVC, MAY occasionally provide wrong results

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if you happen to need something beyond that – take a deep breath and allocate at least several months to understand how does parallelism really work under the hood.