[$] PEP 649 revisited

Back in June, we looked at a change toPython annotations, which provide a way to associate metadata, such as typeinformation, with functions. That changewas planned for the upcoming Python 3.10 release, but was deferred due toquestions about it and its impact on run-time uses of the feature.The Python steering council feltthat more time was needed to consider all of the different aspects of theproblem before deciding on the right approach; the feature freeze for Python 3.10 was onlyaround two weeks off when the decision was announced on April 20. But now, there is most of a yearbefore another feature freeze, which gives the council (and the greaterPython development community) some time to discuss it at a more leisurely pace.