[issue39806] different behavior between __ior__ and __or__ in dict made by PEP 584

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

> Augmented assignment behaves identically to the update method called with a single positional argument, so it also accepts anything implementing the Mapping protocol (more specifically, anything with the keys and __getitem__ methods) or iterables of key-value pairs. This is analogous to list += and list.extend, which accept any iterable, not just lists. Continued from above:

Couldn't link to the specific part but the rationale is explained at https://www.python.org/dev/peps/pep-0584/#specification

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nosy: +xtreak -serhiy.storchaka

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<https://bugs.python.org/issue39806>
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