docs: def leaves(self, prefix=None):
          """
          LIKE items() BUT RECURSIVE, AND ONLY FOR THE LEAVES (non dict) VALUES
          """
          prefix = coalesce(prefix, "")
          output = []
          for k, v in self.items():
              if _get(v, CLASS) in data_types:
                  output.extend(wrap(v).leaves(prefix=prefix + literal_field(k) + "."))
              else:
                  output.append((prefix + literal_field(k), v))
          return output