docs: def flatten_dict_vals(dict_):
      """
      Flattens only values in a heirarchical dictionary, keys are nested.
      """
      if isinstance(dict_, dict):
          return dict([
              ((key, augkey), augval)
              for key, val in dict_.items()
              for augkey, augval in flatten_dict_vals(val).items()
          ])
      else:
          return {None: dict_}