gistfile1.php

<?php

class Entity extends \Pomm\Object\BaseObject
{
    public function getMeFive()
    {
        return 5;
    }
}

// bugged version

$entity = new Entity();
$entity->hasMeFive();    // true
$entity->has('me_five'); // true
$entity->clearMeFive();  // ERROR

// fixed version
$entity = new Entity();
$entity->hasMeFive();    // false
$entity->has('me_five'); // false
$entity->clearMeFive();  // null

gistfile2.php

<?php

class Entity extends \Pomm\Object\BaseObject
{
    public function getMeMore()
    {
        return $this->getA() / $this->getB();
    }

    public function hasMeMore()
    {
       return $this->hasA() and $this->hasB() and $this->getB() !== 0;
    }
}