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  1. or download this
    package MyPack;
    sub foo { use IPC::Open2; my ($in, $out); my $pid = open2($out, $in, q
    +[program --unbuffered]); print $in q|some json|; my $result = <$out>;
    + warn "got [$result]\n"; close($in); close($out); waitpid($pid, 0); }
    1;