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Math::BigFloat 1.998
Math::BigInt 1.9991
Math::BigInt::Calc 1.997

sub _len {
    my $cx = $_[1];
    (@$cx-1)*$BASE_LEN+length(int($cx->[-1]));  # <--- line 1209
}

sub _digit {
    my ($c,$x,$n) = @_;
    my $len = _len('',$x);
    ...
}

@ISA = qw/Math::BigInt/;

...
my $CALC = 'Math::BigInt::Calc';
...
    $n = $n->numify() if ref($n);
    $CALC->_digit($x->{value},$n||0);
}

my ($self,$x,$n) = (undef, $YOUR_n, -1);

Math::BigInt::Calc->_digit(undef, -1);

#!/usr/bin/env perl

...
    say '$n->digit():   ', $n->digit();
};
warn $@ if $@;

123
REF $n: Math::BigFloat
...
$n->digit(-1): 1
$n->digit(1):  2
$n->digit():   3