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Showing content from https://github.com/python/cpython/issues/103699 below:

Add `__orig_bases__` to non-generic TypedDict · Issue #103699 · python/cpython · GitHub

As discussed at the typing summit, non generic TypedDict's completely loose all inheritance information. Funny enough, generic TypedDict's actually preserve it via __orig_bases__ because Generic does that. So this just brings non-generic TypedDicts to be the same.

This is very useful for runtime type checkers, and as per above the attribute already exists for generic TypedDicts

Discussed at PyCon 2023 typing summit, this was an uncontroversial yes at the time.

• GH-103699: Add __orig_bases__ to various typing classes #103698

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