code: def combinate(values):
          '''aggregate multiple values into tuple'''
          prev_v = None
          for v in values:
              if prev_v:
                  if not v:
                      return prev_v
              if not v.status:
                  return v
          out_values = tuple([v.value for v in values])
          return Value(True, values[-1].index, out_values, Nonef combinate(values):
          '''aggregate multiple values into tuple'''
          prev_v = None
          for v in values:
              if prev_v:
                  if not v:
                      return prev_v
              if not v.status:
                  return v
          out_values = tuple([v.value for v in values])
          return Value(True, values[-1].index, out_values, None)
docs: aggregate multiple values into tuple