anchor.diff:  See <<Strongly Typed Everything>> for which types are supported out of the box and how to add custom types.
   
   === Double dash (`--`)
  -When one of the command line arguments is just two dashes without any characters attached (`--`), picocli interprets all following arguments as positional parameters, even arguments that match an option name.
  +When one of the command line arguments is just two dashes without any characters attached (`--`),
  +picocli interprets all following arguments as positional parameters, even arguments that match an option name.
   
   [source,java]
   ----
  
positive.code: ----
  
  
  
  == Help Options
  Options with the attribute `help = true` are special: if one of the command line arguments is a "help" option, picocli will stop parsing the remaining arguments and will not check for required options.
  
negative.code: }
  ----
  
  The `--` end-of-options delimiter clarifies which of the arguments are positional parameters:
  [source,java]
  ----
  String[] args = { "-v", "--", "-files", "file1", "file2" };
  