Description:
------------
Possibility to modify results from func_get_args() inside a function.

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

function foo($params){

    print_r(['Before' => func_get_args()]);
    $params['from_foo1'] = 2;
    print_r(['After' => func_get_args()]);
}

foo(['from_global' => 1]);


Expected result:
----------------
Array
(
    [Before] => Array
        (
            [0] => Array
                (
                    [from_global] => 1
                )

        )

)
Array
(
    [After] => Array
        (
            [0] => Array
                (
                    [from_global] => 1
                )

        )

)

Actual result:
--------------
Array
(
    [Before] => Array
        (
            [0] => Array
                (
                    [from_global] => 1
                )

        )

)
Array
(
    [After] => Array
        (
            [0] => Array
                (
                    [from_global] => 1
                    [from_foo1] => 2
                )

        )

)