PEP 667: Update to account for changes to PEP 558 and feedback from Nick.#2180

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markshannon merged 2 commits intopython:mainfrom markshannon:update-pep667

Dec 6, 2021

+8-47

Commits on Dec 3, 2021

Remove incorrect implementation of pop(). There is an implementation in collections.MutableMapping so it is not needed. Add implementation of __contains__.
markshannon
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Remove outdated section on differences with PEP 558.
markshannon
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