Elevate changes due to php/php-src#14332 to incompatible section

Description

The following code:

<?php                                                                           
echo PHP_VERSION;                                                               
echo "\n";                                                                      
                                                                                
$float = 213.49999999999997;                                                    
$round = round($float, 0, PHP_ROUND_HALF_UP);                                   
                                                                                
var_dump($float);                                                               
var_dump($round);

Resulted in this output:

8.4.1
float(213.49999999999997)
float(213)

But I expected this output instead:

8.3.14
float(213.49999999999997)
float(214)

All tested previous releases did produce the expected output.

PHP Version

PHP 8.4.1

Operating System

official docker php:8.4-cli image

Review the behavior change referenced by php/php-src#14332 and locate the PHP documentation section for round() that describes incompatible changes. Confirm where the PHP 8.4 behavior should be documented, then move or add the change under the incompatible section and verify the resulting documentation structure.