binary-port? -- vonuvoli Definition predicate;
binary-port? (from r7rs);Procedure variants:
((binary-port |1...|) -> (true))
binary-port;... -- at least one time;true;((port |1...|) -> (false))
((any |1...|) -> (false))
vs:io -- (vonuvoli io);binary-port;true;port;false;any;