Diamond inheritance with str

[Lulu of the Lotus-Eaters]

Patrick Earl <patrick at cs.ualberta.ca> wrote previously:
|>>> class A(str): pass
|...
|>>> class B(str): pass
|...
|>>> class C(A,B): pass
|...
|Traceback (most recent call last):
|  File "<stdin>", line 1, in ?
|TypeError: multiple bases have instance lay-out conflict

Likewise:

  >>> class A(tuple): pass
  ...
  >>> class B(tuple): pass
  ...
  >>> class C(A,B): pass
  ...
  Traceback (most recent call last):
    File "<stdin>", line 1, in ?
  TypeError: multiple bases have instance lay-out conflict

I imagine that you could do some clever checks in a metaclass (as
usual), but it feels to me also like that shouldn't be necessary.

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