Parsing Golang syntax after command line argument

I am parsing command line arguments. I am using the following code:

var flagB = flag.Bool("b", false, "boolflag")

func main() {
    flag.Parse()

    fmt.Println(flag.NArg())
    fmt.Println("-b", *flagB)
}

      

        
        
        
      

    

When I execute binary like this:

> test -b "random"

      

        
        
        
      

    

I get the expected result because there is one argument and the flag is set:

1
-b true

      

        
        
        
      

    

However, when I execute the binary, the opposite is true:

> test "random" -b

      

        
        
        
      

    

I get this:

2
-b false

      

        
        
        
      

    

Now the flag is no longer restored as a flag, but as another argument.

Why is that? Is there a definition that flags are first followed by arguments? I always thought that "the argument passing and parsing arguments is" GNU-way ": The first places after binary are reserved for required arguments. And after that you can supply optional arguments and flags.