def respond_to_missing?(name, include_private = false)
      @params.key?(name) ||
      active_params.any? { |param| param.respond_to_missing?(name) } ||
      super
    end
def respond_to_missing?(name, include_private = false)
      @params.key?(name) ||
      active_params.any? { |param| param.respond_to_missing?(name) } ||
      super
    end
Checks whether a parameter with the given name exists for this command

 This is used to determine if a method call would successfully return the
 value of a parameter.

 @return +true+ if named parameter with the specified name exists
 @see #method_missing