Symfony version(s) affected: 4.3.8

Description

When the algorithm is set to true, the passwords are not encoded at all (they are stored as plaintext). I would expect to get an exception instead.

security:
    encoders:
        App\User\User:
            algorithm: true

Additional context
When you mistype the algorithm (e.g. bcryp or aut), an exception is thrown as expected.