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/usr/share/perl/5.22.1/integer.pm is in perl-modules-5.22 5.22.1-9ubuntu0.6.

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The actual contents of the file can be viewed below.

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package integer;

our $VERSION = '1.01';

$integer::hint_bits = 0x1;

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

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

1;