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Until now, we only assigned the _handle on `zmq::socket_t::operator=(socket_t&&)`. This manifests when trying to monitor a socket initialized by that constructor. To avoid changing the public interface of the socket_t class, we tested for the specific monitor usecase, since it's the only class accessing zmq::socke_t::ctxptr. NOTE: When running the new unit-test without the fix, it might hang on `zmq_socket_monitor(socket_, NULL, 0)`. We haven't figured out the cause for that, but we deemed it unimportant (or at least out of scope).