docs: def remaining_weight_color_hsl(
          ws,  # type: List[FeatureWeight]
          weight_range,  # type: float
          pos_neg,  # type: str
      ):
      # type: (...) -> _HSL_COLOR
      """ Color for "remaining" row.
      Handles a number of edge cases: if there are no weights in ws or weight_range
      is zero, assume the worst (most intensive positive or negative color).
      """
      sign = {'pos': 1.0, 'neg': -1.0}[pos_neg]
      if not ws and not weight_range:
          weight = sign
          weight_range = 1.0
      elif not ws:
          weight = sign * weight_range
      else:
          weight = min((fw.weight for fw in ws), key=abs)
      return weight_color_hsl(weight, weight_range)