Description:
------------
iterator_to_array() does not add all values yielded from a generator if yield from is used in the generator.

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

function gen1() {
    yield 1;
    yield from gen2();
    yield 5;
}

function gen2() {
    yield 2;
    yield 3;
    yield 4;
}

print_r(iterator_to_array(gen1(), true));

$result = [];

foreach (gen1() as $yielded) {
    $result[] = $yielded;
}

print_r($result);


Expected result:
----------------
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

Actual result:
--------------
Array
(
    [0] => 2
    [1] => 5
    [2] => 4
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)