[issue31954] Don't prevent dict optimization by coupling with OrderedDict

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

It the pure Python implementation PyDict_GetItem also
returns value, not node of linked list.

> How about raising DeprecationWarning when OrderedDict is passed to
PyDict_* APIs?

This would violate the Liskov substitution principle and add an overhead for using PyDict_* APIs with regular dicts.

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