if given. close the sockets when the block exits.
(Socket.udp_server_loop): use udp_server_sockets in block form.
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if given. close the sockets when the block exits.
(Socket.tcp_server_loop): use tcp_server_sockets in block form.
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(Socket.udp_server_loop_on): new method.
(Socket.udp_server_loop): new method
(Socket.ip_sockets_port0): extracted from tcp_server_sockets_port0.
(Socket::UDPSource): new class.
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private function for allocating same port both IPv4 and IPv6.
(Socket.tcp_server_sockets): use tcp_server_sockets_port0 for port 0.
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