Not necessarily anything to do with STDIN/STDOUT, this goes through double encoding and no decoding as well:
open(INPUT, "<input");
open my($in), "<&:encoding(japhy)", "INPUT" or die $!;
open my($out), ">&:encoding(japhy)", "STDOUT" or die $!;
print $out $_ while <$in>;
close(INPUT);
The output is:
> < abc
> < def
Update:
Confirmed that it works fine if you call binmode afterwards. It looks like this bug:
http://rt.perl.org/rt3/Ticket/Display.html?id=34595
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