Mon, Oct 2, 2017 at 2:52 PM, Koos Zevenhoven <k7ho...@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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