fix: getLogLevel return type

[skjnldsv]

Fixes #43534

[susnux]

Ah yes had the same issue as something set the default to '0'. But maybe we should add some logging for this case to warn the user that the log level config is invalid?
Maybe something like:

try {
   $loglevel = (int)$this->config->getValue('loglevel', ILogger::WARN);
} catch (\TypeError $e) {
  // can we use the logger here? if not then use errorlog
}

The reason would be to prevent confusion why the loglevel is not respected, got some similar issues in the past leading to wasted hours of debugging 😅

[susnux]

Works but I think the logging (see commit) would make sense

[come-nc]

As @susnux pointed out we should log an error or cast the value to int.

[nickvergessen]

Ref #44262