123
REF $n: Math::BigFloat
Can't use an undefined value as an ARRAY reference at /Users/ken/perl5/perlbrew/perls/perl-5.18.1t/lib/5.18.1/Math/BigInt/Calc.pm line 1209.
$n->{value} EXISTS: No
$n->{value} DEFINED: No
$n->digit(-1): 1
$n->digit(1):  2
$n->digit():   3