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=head1 WARNING

Both functions convert their argument to a string internally. This will break for large (<32 bit)numbers
due to Perl representing them in standard form when stringified. To get round this, either pass the number as a string to
begin with, or use the bignum module in your program.

Thus:

    my $num = 57382957482395748329574923; # Big number!
    verhoeff_get($num); # Fatal error unless program uses bignum module.

But:

    my $num = '57382957482395748329574923'; # Long string!
    verhoeff_get($num); # Works fine.

=head1 SEE ALSO

L<bignum>