What layer string should I pass to binmode in a context like this, where I don't (by definition) know what encoding the file I'm opening uses? Doing this:

    open FH, $_    or die qq(can't open "$_" for reading\n);
    binmode FH, ':raw';
    my @lines = <FH>;
    close FH;
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has no effect on the program's behavior, and anything more specific than ":raw" would seem to entail a premature assumption about what encoding an unknown file uses.