Description:
------------
Issues with overriding parameters of the same function with different types is causing a compilation errors that I don't know how to fix.

If there is a fix, can you please let me know and put it somewhere on the Internet so Google and I can find it.

Test script:
---------------
class Fie{
protected $value;

function copy(Fie $new) : Fie
{
$this->value = $new->value;
return $this;
}
}

class Foh extends Fie{
protected $field;

function copy(Foh $new) : Foh
{
$this->field = $new->field;
return parent::copy($new);
}
}

Expected result:
----------------
Not needing to totally rewrite Fie's code in Foh.


$n = new Foh();
$b = new Foh();
$b->copy($n);

Actual result:
--------------
PHP Fatal error:  Declaration of Foh::copy(Foh $new): Foh must be compatible with Fie::copy(Fie $new): Fie in test_file.php on line 29

Fatal error: Declaration of Foh::copy(Foh $new): Foh must be compatible with Fie
::copy(Fie $new): Fie in test_file.php on line 29