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Type of binary input/output ports.
<binary-input/output-port>: <port> type-constructor portValidate port as instance of <binary-input/output-port> and return it.
<binary-input/output-port>: <boolean> type-predicate objThe type predicate is binary-input/output-port?.
<binary-input/output-port>: <boolean> eof? thisApply port-eof? to the instance and return its return value.
<binary-input/output-port>: () flush thisApply flush-output-port to the instance.