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If the socket is closed (with pseudo_tcp_socket_close()) with FIN–ACK unsupported, it should transition to the CLOSED state when pseudo_tcp_socket_get_next_clock() returns FALSE (as that’s the old-style indication that the socket has closed). This is a behaviour change from before the introduction of FIN–ACK: previously, the socket would stay in the ESTABLISHED state. However, this should not have been easily detectable by consumers of the API, as pseudo_tcp_socket_is_closed() did not exist then.
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