`ReflectionMethod::invokeArgs()` for `Closure::__invoke()` accepts objects from different Closures

[TimWolla]

Description

The following code:

<?php

$c = function ($foo, $bar) {
	echo "foo: {$foo}, bar: {$bar}\n";
};

$m = new ReflectionMethod($c, '__invoke');

$firstParam = $m->getParameters()[0]->getName();
var_dump($firstParam);
$secondParam = $m->getParameters()[1]->getName();
var_dump($secondParam);

$args = [
    $firstParam => 'FOO',
    $secondParam => 'BAR',
];

$m->invokeArgs(function ($bar, $foo) {
	echo "foo: {$foo}, bar: {$bar}\n";
}, $args);

Resulted in this output:

string(3) "foo"
string(3) "bar"
foo: BAR, bar: FOO

But I expected this output instead:

string(3) "foo"
string(3) "bar"
Fatal error: Uncaught ReflectionException: Given object is not an instance of the class this method was declared in

Semantically closures are behave if they were different, incompatible, classes that extend a Closure base class and the __invoke() method is defined on the closure-specific class rather than the base class. The observable signature differs for each Closure definition. This is also becoming obvious by new ReflectionMethod('Closure', '__invoke') failing when only the classname rather than an object is being provided:

Fatal error: Uncaught ReflectionException: Method Closure::__invoke() does not exist in php-src/test6.php:7
Stack trace:
#0 php-src/test6.php(7): ReflectionMethod->__construct('Closure', '__invoke')
#1 {main}
  thrown in php-src/test6.php on line 7

PHP Version

git master @ f99ca6347f456e18adb22c8c89e92681bb55d84d

Operating System

No response