Anonymous value placed after a flag argument fails to be used

[lastunicorn]

Let a command named "display" have to parameters:

• bool - name: "all"; short name: "a"
• string - anonymous;

The command: app-name display -a John

• is expected to display all the persons called "John".
• it actually returns an error because the name "John" is mistakenly used as a value for the boolean parameter "all"
  DustInTheWind.ConsoleTools.Commando.MetadataModel.InvalidParameterValueException: 'John' is not a valid value for 'all'.

Same error is returned even if -- is used:
app-name display -a -- John