docs: def _build_list_params(param_name, key, values):
          """Builds a list of POST parameters from a list or single value."""
          params = {}
          if hasattr(values, '__iter__'):
              index = 0
              for value in values:
                  params[str(param_name) + '[' + str(index) + '].' + str(key)] = str(value)
                  index += 1
          else:
              params[str(param_name) + '[0].' + str(key)] = str(values)
          return params