Commander::Command#when_called

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Handle execution of command. The handler may be a class,
object, or block (see examples below).

=== Examples

  # Simple block handling
  c.when_called do |args, options|
     # do something
  end

  # Create inst of Something and pass args / options
  c.when_called MyLib::Command::Something

  # Create inst of Something and use arbitrary method
   c.when_called MyLib::Command::Something, :some_method

  # Pass an object to handle callback (requires method symbol)
  c.when_called SomeObject, :some_method
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