Hang in Windows after upgrade 8.4.6 to 8.4.7, unpacking IteratorAggregate with custom Traversable when unpacking

[dynasource]

Description

The following code hangs in after testing out 8.5. Narrowed it down to an earlier version 8.4.7 in which this behavior first occurs. In 8.4.6 is works with no issues. Seems only to apply in Windows. In non-windows it seems to run fine: https://3v4l.org/eRYIJ#v8.4.7

<?php
class ArrayMap implements \Iterator
{
	public function __construct(private array $array)
	{
	}

	public function current(): mixed
	{
		return current($this->array);
	}

	public function next(): void
	{
		next($this->array);
	}

	public function key(): int|string|null
	{
		return key($this->array);
	}

	public function valid(): bool
	{
		return key($this->array) !== null;
	}

	public function rewind(): void
	{
		reset($this->array);
	}
}

class Aggregate implements \IteratorAggregate
{
	public function __construct(private array $array)
	{
	}

	public function getIterator(): Traversable
	{
		return new ArrayMap($this->array);
	}
}

class Y
{
}
class Z
{
}

$_1 = new Aggregate([Z::class => Z::class,]);
var_dump(1);

$_2 = [...iterator_to_array($_1, true)];
var_dump(2);

$_3 = [...$_2, Y::class => Z::class];
var_dump(3);

$_4 = new Aggregate($_3);
var_dump(4);

[...$_4];
var_dump(5);

Resulted in this output:

int(1)
int(2)
int(3)
int(4)
it hangs here with max cpu

But I expected this output instead:

int(1)
int(2)
int(3)
int(4)
int(5)

PHP Version

PHP 8.4.7 (cli) (built: May  6 2025 14:14:22) (NTS Visual C++ 2022 x64)
Copyright (c) The PHP Group
Zend Engine v4.4.7, Copyright (c) Zend Technologies

Operating System

Windows

[ndossche]

I can reproduce this with the package I download, but not with a version I build on my local system.
@shivammathur What builder is used nowadays for Windows and what would be the easiest way to replicate exactly that on my local VM?

[shivammathur]

@ndossche

We use this for Windows builds
https://github.com/php/php-windows-builder#build-php