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package PerlIO::via::AnyCRLF;    # save as PerlIO/via/AnyCRLF.pm

...
    return $len > 0 ? $buf : undef;
}
1;

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#!/usr/bin/perl
use strict;
use warnings;
...
open my $f, "<:crlf:via(AnyCRLF)", "le.txt" or die $!;

print while <$f>;