Description:
------------
Compared to 5.x. Behaviour of LSB (?) changed, bug or not documented?
I cannot find anything about this subtle change in the 7.0 migration guide (http://php.net/manual/en/migration70.incompatible.php) nor in the 7.0 NEWS file.

See https://3v4l.org/edVna

I know it's easy to fix in the codebase, but it would be nice if this changed is documented when intended or original behavior restored.

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

class A {
    const TEST = false;
    
    public function test()
    {
        var_dump(static::TEST);
    }
}

class B extends A {
    const TEST = true;
    
    public function test()
    {
        A::test();
    }
}

$b = new B;
$b->test();

Expected result:
----------------
bool(true)

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