page function in Record.php has a bug that cause offset with a negative number

[JihanZhuang]

if page = 984851907999915581,limit=10,($page - 1) * $limit cause it to be a float.so after (int)offset,it change to a negative number;
I have change it like this:

public function offset($offset)
{
$offset=(int)$offset;
$offset < 0 && $offset = 0;
return $this->add('offset', $offset);
}

[twinh]

fixed, thank you!