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/usr/lib/x86_64-linux-gnu/perl-base/utf8.pm is in perl-base 5.22.1-9.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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package utf8;

$utf8::hint_bits = 0x00800000;

our $VERSION = '1.17';

sub import {
    $^H |= $utf8::hint_bits;
}

sub unimport {
    $^H &= ~$utf8::hint_bits;
}

sub AUTOLOAD {
    require "utf8_heavy.pl";
    goto &$AUTOLOAD if defined &$AUTOLOAD;
    require Carp;
    Carp::croak("Undefined subroutine $AUTOLOAD called");
}

1;
__END__