anchor.diff:  ----
   
   See also the https://github.com/remkop/picocli/tree/master/picocli-examples/src/main/java/picocli/examples/logging[logging] example in `picocli-examples` for a way to modify only the Log4j ConsoleAppenders' log level from the specified verbosity.
  -
  -
  -=== Use Case: Sharing Options
  -
  -A common use case is sharing options between different levels of the command hierarchy, so that "global" options from the top-level command are also available on subcommands.
  -
  -Since picocli 4.2, <<_parentcommand_annotation,`@ParentCommand`-annotated>> fields can be used in mixins, which makes this easier. Here is an example implementation:
  -
  -[source,java]
  -----
  -// Define a mixin that delegates to the parent command.
  -class MyMixin {
  -    @ParentCommand Top top;
  -
  -    @Option(names = "-v")
  -    public void setVerbose(boolean[] verbosity) { top.setVerbose(verbosity); }
  -}
  -
  -// An example Top-level command with two subcommands.
  -// The `-v` option can be specified on the top-level command as well as the subcommands.
  -@Command(subcommands = Sub2.class)
  -class Top implements Runnable {
  -    private boolean[] verbosity = new boolean[0];
  -
  -    @Option(names = {"-v", "--verbose"})
  -    public void setVerbose(boolean[] verbosity) { this.verbosity = verbosity; }
  -
  -    public void verbose(String pattern, Object... params) {
  -        if (verbosity.length >= 1) {
  -            System.out.printf(pattern, params);
  -        }
  -    }
  -
  -    public void run() { verbose("Hello from top%n"); }
  -
  -    public static void main(String[] args) {
  -        new CommandLine(new Top()).execute(args);
  -    }
  -
  -    // The @Mixin-annotated parameter adds the `-v` option to this subcommand.
  -    @Command
  -    void sub1(@Mixin MyMixin mymixin) { verbose("Hello from sub1%n"); }
  -}
  -
  -// Subcommand classes can mix in the `-v` option with a @Mixin-annotated field.
  -@Command(name = "sub2")
  -class Sub2 implements Runnable{
  -    @Mixin MyMixin mymixin;
  -
  -    @Override
  -    public void run() { mymixin.top.verbose("Hello from sub2%n"); }
  -}
  -----
  -
  -With this, the `-v` option can be specified on the top-level command as well as the subcommands, so all of the below are valid invocations:
  -
  -----
  -java Top -v
  -java Top -v sub1
  -java Top sub1 -v
  -java Top -v sub2
  -java Top sub2 -v
  -----
  -
  -All of these invocations will print some output, since the `-v` option was specified.
   
   === Reuse Combinations
   
  
positive.code: 
  
  ==== Maps
  Picocli v1.0 introduced support for `Map` fields similar to Java's system properties `-Dkey=value` or Gradle's project properties `-Pmyprop=myvalue`.
  
  `Map` fields may have any type for their key and value
  as long as a <<Strongly Typed Everything,converter>> is registered for both the key and the value type.
  
negative.code: 
  
  ==== Repeated Boolean Options
  Boolean options with multiple values are supported from picocli 2.1.0.
  [source,java]
  ----
  @Option(names = "-v", description = { "Specify multiple -v options to increase verbosity.",
  