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sub blog10 {
    my $bn = shift;
...
print "blog10($bn): $blog10\n";
print "mod($blog10,3): ", $blog10 % 3, "\n";
print "int($blog10): ", int($blog10), "\n";

blog10(1000000000000): 12
mod(12,3): 0
int(12): 12

return (ref($bn) ? $bn->copy : Math::BigInt->new($bn))->blog(10)->numi
+fy;

sub blog10 {
    my $n = shift;
...

    return ref($n) ? $ret : $ret->numify;
}