Hi,

I am confused by the description of isLoggingEnabled.

In my unittest version I want to disable logging and use this command:
``` d
sharedLog = new NullLogger(LogLevel.off);
```

If have some stdout writeln coding (to avoid the timestamp / module prefix):

``` d
private void printRuntimeLog(string logFilePath)
{
    import std.stdio : stdout;

    if (isLoggingEnabled(LogLevel.info))
    {
        logFilePath.readText.strip.splitLines.map!(line => "[runtime-log] " ~ line).each!(line => stdout.writeln(line));
        stdout.flush;
    }
}
```

I just want to check whether LogLevel.info or more is active. But the method isLoggingEnabled seems to expect the LogLevel 3 times?

```
@safe bool isLoggingEnabled()(LogLevel ll, LogLevel loggerLL, LogLevel globalLL, lazy bool condition = true);
```

Another strange thing is, the description of isLogginEnabled (https://dlang.org/phobos/std_experimental_logger_core.html#.isLoggingEnabled) mentions a call with only 1 logLevel argument, but this method does not seems to exist:

> pure bool isLoggingEnabled()(LogLevel ll) @safe nothrow @nogc

Is there an easy way to check if log level is "info" or more?

Kind regards
André