PEP 661: Sentinel Values

On behalf of the Python Steering Council, I’m very happy to share that we have accepted PEP 661 for Python 3.15. Thank you @taleinat for creating the PEP and @Jelle for reviving it in time for 3.15. We especially appreciate how all of the SC’s earlier feedback was addressed nicely in the latest iteration of the PEP, resolving all of our previous concerns. Congrats!

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