Description:
------------
Issue found while using the vfsStream library [0]. copy() always return false even if the data are actually copied.


This behaviour change seems to be present since https://github.com/php/php-src/commit/11f3e24190fa45689c8ccaeea54a28db6752092e


[0] https://github.com/bovigo/vfsStream

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

// See https://github.com/LeSuisse/php74-rc2-streamwrapper-bug

require_once __DIR__ . '/vendor/autoload.php';

$fs = org\bovigo\vfs\vfsStream::setup();
$source_path = $fs->url() . '/f1';
file_put_contents($source_path, 'A');
$destination_path = $fs->url() . '/f2';
var_dump(copy($source_path, $destination_path));
var_dump(file_get_contents($destination_path));

Expected result:
----------------
bool(true)
string(1) "A"

Actual result:
--------------
bool(false)
string(1) "A"