std.logger issue

[o3o via Digitalmars-d-learn]

```
// rdmd --main -unitest app.d
import std.stdio;
import std.logger;
unittest {
   globalLogLevel = LogLevel.all;
   infof("g: %s", globalLogLevel);
   trace("trace"); // NO output!
   info("info");
   warning("warn");
   error("error");
}
```

output is:
```
2023-01-26T18:16:13.546 [info] log.d:6:main g: all
2023-01-26T18:16:13.546 [info] log.d:8:main info
2023-01-26T18:16:13.546 [warning] log.d:9:main warn
2023-01-26T18:16:13.546 [error] log.d:10:main error
```
how can I enable `trace` level?
Thank