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Re:PEP 563, PEP 649 and the future of pydantic and FastAPI by boublepop on Friday April 16, 2021 @02:03PM (#26837169)
They appeared in 3.5, and the new pep is from 3.7, which will now be released in 3.10.

This isn’t something sudden especially not to anyone using type annotations.

Re:PEP 563, PEP 649 and the future of pydantic and FastAPI by travisjungroth on Friday April 16, 2021 @05:35PM (#26839333)
That, on the other hand, is a very legitimate criticism. They could have raised the issue more aggressively sooner.