add newsfragment

PyO3 · Feb 17, 2024 · 11bc256 · 11bc256
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diff --git a/newsfragments/3849.added.md b/newsfragments/3849.added.md
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+Implement `ExactSizeIterator` for `set` and `frozenset` iterators on `abi3` feature.
diff --git a/newsfragments/3849.changed.md b/newsfragments/3849.changed.md
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+`PySet` and `PyFrozenSet` iterators now always iterate the equivalent of `iter(set)`. (A "fast path" with no noticeable performance benefit was removed.)