MongoDB C++11 Driver 4.3.0 Released

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This is the commit: v1::exception and v1::server_error (CXX-3237, CXX-3238) (#1501) · mongodb/mongo-cxx-driver@82f77b6 · GitHub

And looking at the code in question, it seems to be some kind of exception mapping:

template <typename exception_type>
[[noreturn]] void throw_exception(v1::exception const& ex) {
    if (auto const ptr = dynamic_cast<v1::server_error const*>(&ex)) {
        throw exception_type{
            ptr->code(), bsoncxx::v_noabi::document::value{bsoncxx::v_noabi::from_v1(ptr->raw())}, ptr->what()};
    }

    throw exception_type{ex.code(), ex.what()};
}

Maybe the dynamic cast could be avoided by overloading with a v1::server_error parameter - if callers still have the full type info.

Also, just for my personal curiosity, why does this exception mapping happen in the first place?