old_contents: class Base1:
      def __init__(self, *args):
          print("Base1.__init__", args)
  
  class Ctuple1(Base1, tuple):
      pass
  
  a = Ctuple1()
  print(len(a))
  a = Ctuple1([1, 2, 3])
  print(len(a))
  
  print("---")
  
  class Ctuple2(tuple, Base1):
      pass
  
  a = Ctuple2()
  print(len(a))
  a = Ctuple2([1, 2, 3])
  print(len(a))
  
new_contents: class Base1:
      def __init__(self, *args):
          print("Base1.__init__", args)
  
  class Ctuple1(Base1, tuple):
      pass
  
  a = Ctuple1()
  print(len(a))
  a = Ctuple1([1, 2, 3])
  print(len(a))
  
  print("---")
  
  class Ctuple2(tuple, Base1):
      pass
  
  a = Ctuple2()
  print(len(a))
  a = Ctuple2([1, 2, 3])
  print(len(a))
  
  a = tuple([1,2,3])
  b = Ctuple1([1,2,3])
  c = Ctuple2([1,2,3])
  
  print(a == b)
  print(b == c)
  print(c == a)
  
subject: Expand test cases for equality of subclasses.