docs: def _dict_value_to_pairs(d):
      """
      Takes the first value of a dictionary (which it self should be
      a dictionary) and turns it into a series of {key: value} dicts.
  
      For example, _dict_value_to_pairs({'c': {'a': 1, 'b': 2}}) will yield
      {'a': 1} and {'b': 2}.
  
      """
      d = d[tz.first(d)]
  
      for k, v in d.items():
          yield {k: v}