Should the absence of create_sid() method generate a DEPRECATED instead of WARNING message? #23547

Description

When using a custom session handler in PHP 8.6.0beta2 I get the following message:

PHP Warning: Class MyNamespace\SessionHandlerDb implementing SessionHandlerInterface is missing the create_sid() method which will be required in PHP 9.0

Is a WARNING a bit harsh? It's also not consistent with the level of message from session_set_save_handler():

PHP Deprecated: session_set_save_handler(): Providing an object to argument #1 ($sessionhandler) which does not have the create_sid() method defined is deprecated

PHP Version

PHPP 8.6.0beta2

Operating System

Windows