Description:
------------
I have created a class A with static boolean variable $bool and class B which itherits from A. If I change value of $bool in class B, values A::$bool and B::$bool differ. All other types (integers and strings) works fine.
Is this a bug ?

Reproduce code:
---------------
class A
{
	public static $bool = false;
}

class B extends A
{
}

B::$bool = true;

Expected result:
----------------
B::$bool = true
A::$bool = true

Actual result:
--------------
B::$bool = true
A::$bool = false