FWIW, it already has :unix, you shouldn't use it twice 
$ set PERLIO_DEBUG=the-binmodeless.txt
$ perl fudge
$ set PERLIO_DEBUG=the-binmode.txt
$ perl fudge binmode

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In reply to Re: Win32: Setting a layer with binmode causes problem with close() on Windows (nonsense) by Anonymous Monk
in thread Win32: Setting a layer with binmode causes problem with close() on Windows by rovf

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