public function testCompare()
{
$this->eq(s::compare('', ''), 0);
$this->lt(s::compare('aaa', 'aaaa'), 0);
$this->lt(s::compare('aaa', 'aab'), 0);
$this->gt(s::compare('bbb', 'aaa'), 0);
$this->eq(s::compare('aaa', 'aaa'), 0);
}
public function compare($that)
{
return s::compare($this->value, self::unwrap($that));
}