SessionHandlerInterface::gc returning true is not allowed (contradicts example and session_set_save_handler callable)

From manual page: https://php.net/class.sessionhandlerinterface

The SessionHandlerInterface documentation for method gc states that it may only return int|false. It also states in the method gc documentation that it used to also return true before PHP 7.1.

Two things contradict these statements:

1. The example code given on the SessionHandlerInterface documentation lets method gc return true
2. The session_set_save_handler documentation states that if individual callables are provided, the gc callable must return bool (true or false)

Compare the SessionHandlerInterface documentation and example at https://php.net/class.sessionhandlerinterface with the session_set_save_handler documentation cited in the issue. Determine the consistent return-value wording and update the affected documentation so the method description, example, and callable guidance no longer contradict one another.