Do not use the CI 4 session library

Today I have the PHP Session with Redis configuration, with fallback, name configuration, etc., all defined in my php.ini file, however in CI4 I cannot use PHP's native session_start() to create my sessions.

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Just out of curiosity, because I use PHP session settings geared for Redis too, what is it with CI4 sessions that doesn't work with PHP sessions using Redis?

-joho