The logging behavior as documented by this snippet on the logging techniques page:

const app = await NestFactory.create(AppModule, {
  logger: ['error', 'warn'],
});
await app.listen(process.env.PORT ?? 3000);

doesn't convey the observed behavior that when the logging level is set to just

['log']

you'll actually get all log,warn,error and fatal log entries.

There seems to be an inherited, cascading nature such that debug levels would include log,warn,error,fatal but that is not obviously documented that I can see.

I'd like to confirm that behavior and intent and then update the documentation.