anchor.diff:  [source, java]
   ----
   class ArityDemo {
  -    @Parameters(arity = "1..3", descriptions = "one to three Files")
  +    @Parameters(arity = "1..3", description = "one to three Files")
       File[] files;
   
       @Option(names = "-f", arity = "2", description = "exactly two floating point numbers")
  
positive.code: import java.io.File;
  
  class Convert {
      @Option(names = "-patterns", description = "the regex patterns to use");
      Pattern[] patterns;
  
      @Parameters(/* type = File.class, */ description = "the files to convert")
  
negative.code: 
  commandLine.parseArgs("-a", "AES/CBC/NoPadding", "en-GB");
  assert app.locale.toLanguageTag().equals("en-GB");
  assert app.cipher.getAlgorithm().equals("AES/CBC/NoPadding");
  ----
  
  CAUTION: _Note on subcommands:_ the specified converter will be registered with the `CommandLine` object
  