docs: def caller_locals():
      # type: () -> Dict
      """Return the frame object for the caller's stack frame."""
      try:
          raise ValueError
      except ValueError:
          _, _, tb = sys.exc_info()
          assert tb, "Can't get traceback, this shouldn't happen"
          caller_frame = tb.tb_frame.f_back.f_back
          return caller_frame.f_locals