Including test script in report since link may vanish

Test script:
------------

<?php

class A {
	
	private static function VALUE1(){
	    return 'func';
	}
	
	private static $VALUE2 = 'var';
	
	private const VALUE3 = 'cost';

	public static function func_value(){
		return static::VALUE1();
	}
	
	public static function member_value(){
	    return static::$VALUE2;
	}
	
	public static function const_value(){
	    return static::VALUE3;
	}

}

class B extends A { }

echo A::func_value();
echo "\n";
echo B::func_value();

echo "\n---\n";

echo A::member_value();
echo "\n";
echo B::member_value();

echo "\n---\n";

echo A::const_value();
echo "\n";
echo B::const_value();

Also ran into this problem in the context of using isset(). Would be nice to know whether this is considered a bug or a feature going forward so that I would know whether to wait for a fix or not before upgrade. The following test script can also illustrate the issue:

https://3v4l.org/3cJ5N


Test script:
---------------
<?php

class foo {
    private static $foo = true;
    
    public static function test() {
        var_dump(isset(static::$foo));
    }
}

class none extends foo {
   
}

class overmethod extends foo {
    public static function test() {
        var_dump(isset(static::$foo));
    }
}

class overprop extends foo {
    private static $foo = null;
}

none::test();
overmethod::test();
overprop::test();

Expected result:
----------------
bool(false)
bool(false)
bool(false)

Actual result:
--------------
bool(true)
bool(false)
bool(false)

@riikka dot kalliomaki at gmail dot com: The behavior for static properties was fixed in 7.4 already, this bug is about the remaining issue for class constants.