Ok so after changing my callback sub to this

sub callback {
    my ( $sftp, $data, $offset, $size ) = @_;
    use Math::Pari qw( :DEFAULT PARI pari2num );
    print 'offset is a: ';
    print ref $offset;
    print "\n";
    $offset = pari2num($offset);
    print 'now offset is a: ';
    print ref $offset;
    print "\n";
    print 'size is a: ';
    print ref $size;
    print "\n";
    $size = pari2num($size);
    print 'now size is a: ';
    print ref $size;
    print "\n";
    my $percent = ($offset/$size) * 100;
    print "percent=$percent\n";
    return;
}
[download]

Things now start to make sense to me in the output:

offset is a: 
now offset is a: 
offset=0
size is a: Math::Pari
size is a: 
size=666974
percent=0
offset is a: 
now offset is a: 
offset=8192
size is a: Math::Pari
size is a: 
size=666974
percent=1.22823378422547
offset is a: 
now offset is a: 
offset=16384
size is a: Math::Pari
size is a: 
size=666974
percent=2.45646756845094
[download]

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