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        $sum = sum(1, 2, 3);
        $sum = sum(1.2, 3.14159);
        $sum = sum( qw(t1 10 t2 5 6) ); # only performs 10+5+6 = 21

        # shuffling an array
        @ori_nums = (1, 3, 5, 7, 9, 11, 13, 15);
        @shuffled = shuffle(@ori_nums);

=head1 EXPORT

None by default

=head1 SUBROUTINES

=head2 sum( LIST )

Obtains the sum of a list of numbers. If no numbers are passed in, it will return C<undef>.
A mixture of numbers and non-numerics will work too. However, complex and scientific 
numbers are not supported.

The C<sum> subroutine in version 0.03 is broken