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>perl -e "open $fh, '-'; print *$fh{IO}
IO::Handle=IO(0x22532c)

>perl -e "print *STDOUT{IO}
IO::Handle=IO(0x225cfc)

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>perl -e "STDOUT->flush()
Can't locate object method "flush" via package "IO::Handle"

>perl -e "use IO::Handle; STDOUT->flush()