So if we add function to handle the conversion to an integer there should be one call to truncate and other call to the overload integer function.

#!/usr/bin/env perl
#
use strict;
use warnings;

package Soldier;

use overload '0+' => \&truncate,
             'int' => \&my_int;

my $soldier1 = { NAME => 'BENJAMIN',
                 RANK => 'PRIVATE',
                 SERIAL => 151.11 };

bless $soldier1;

print int($soldier1), "\n";

sub truncate {
        print "sub truncate called: ", $_[0]->{SERIAL}, "\n";
        return $_[0]->{SERIAL};
}

sub my_int {
        print "sub my_int called: ", $_[0]->{SERIAL}, "\n";
        return int($_[0]->{SERIAL});
}
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Produces the (unexpected) output;

sub my_int called: 151.11
151
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Thoughts?