docs: def concat(self, values, first=False):
          """
          :param values:
          :type values: TList[T]
          :param first:
          :type first: bool
          :rtype: TList[T]
  
          Usage:
  
              >>> TList([1, 2]).concat(TList([3, 4]))
              [1, 2, 3, 4]
              >>> TList([1, 2]).concat(TList([3, 4]), first=True)
              [3, 4, 1, 2]
          """
          return values + self if first else self + values