def method_missing(method, *args, &blck)
      if data.key?(method.to_s)
        Bunto::Deprecator.deprecation_message "Document##{method} is now a key "\
                           "in the #data hash."
        Bunto::Deprecator.deprecation_message "Called by #{caller.first}."
        data[method.to_s]
      else
        super
      end
    end
def method_missing(method, *args, &blck)
      if data.key?(method.to_s)
        Bunto::Deprecator.deprecation_message "Document##{method} is now a key "\
                           "in the #data hash."
        Bunto::Deprecator.deprecation_message "Called by #{caller.first}."
        data[method.to_s]
      else
        super
      end
    end
Override of method_missing to check in @data for the key.