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Mon Oct 2 17:59:52 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-October/149701.html

 Mon, Oct 2, 2017 at 2:52 PM, Koos Zevenhoven <k7hoven at gmail.com> wrote

> I don't mind this (or Nathaniel ;-) being academic. The backwards
> incompatibility issue I've just described applies to any extension via
> composition, if the underlying type/protocol grows new members (like the CM
> protocol would have gained __suspend__ and __resume__ in PEP521).
>

Since you seem to have a good grasp on this issue, does PEP 550 suffer from
the same problem? (Or PEP 555, for that matter? :-)

-- 
--Guido van Rossum (python.org/~guido)
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[Python-Dev] Inheritance vs composition in backcompat (PEP521)