Undefined variable variable $GLOBALS

Description

The following code:

<?php

$variable = 'GLOBALS';

$GLOBALS['GLOBALS'] = 'value';

var_dump($GLOBALS);

https://3v4l.org/lpfq6

Resulted in this output:

array(8) {
  ["_GET"]=>
  array(0) {
  }
  ["_POST"]=>
...
}

But I expected this output instead:

string(5) "value"

The global variable GLOBALS shouldn't be allowed because it's hidden behind the superglobal.

Another problem with this superglobal:
Calling $variable = 'GLOBALS';$$variable; outputs Warning: Undefined variable $GLOBALS, but that's not what the user expects, because $GLOBALS is available. I know it's stated in documentation that superglobal array is not allowed, but this error message could be less confusing.
https://www.php.net/manual/en/language.variables.variable.php

PHP Version

PHP 8.4

Operating System

No response

Start with the PHP manual page on variable variables linked in the issue and compare its explanation of superglobals with the PHP 8.4 examples provided. Done means the documentation accurately explains the $GLOBALS behavior and the potentially confusing undefined-variable warning.