Description:
------------
If unset() is used on a member variable, subsequent calls to __get and __set take effect as if the variable was not defined as a property.  This may be a feature, but the behavior was different in 5.0.4.

Reproduce code:
---------------
Class A {
        private $foo = 5;
        private $x = array();

        public function __get($name) {
                if(!isset($this->x[$name]))
                        echo "Property $name is not set!";
                else
                        return $this->x[$name];
        }

        public function bar() {
                unset($this->foo);
                return $this->foo;
        }

}

$a = new A();
echo $a->bar();


Expected result:
----------------
In PHP 5.0.4:

PHP Notice:  Undefined variable: foo

Actual result:
--------------
In PHP 5.0.5:

Property foo is not set!