WIP: Add changelog and migration guide entries.

PyO3 · Dec 24, 2023 · 34d5fd6 · 34d5fd6
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diff --git a/guide/src/migration.md b/guide/src/migration.md
@@ -75,6 +75,10 @@ Python::with_gil(|py| {
 });
 ```
 
+### `Python::allow_threads` was split into `Python::safe_allow_threads` and `Python::unsafe_allow_threads`
+
+TODO
+
 ### `Iter(A)NextOutput` are deprecated
 
 The `__next__` and `__anext__` magic methods can now return any type convertible into Python objects directly just like all other `#[pymethods]`. The `IterNextOutput` used by `__next__` and `IterANextOutput` used by `__anext__` are subsequently deprecated. Most importantly, this change allows returning an awaitable from `__anext__` without non-sensically wrapping it into `Yield` or `Some`. Only the return types `Option<T>` and `Result<Option<T>, E>` are still handled in a special manner where `Some(val)` yields `val` and `None` stops iteration.

diff --git a/newsfragments/3646.changed.md b/newsfragments/3646.changed.md
@@ -0,0 +1 @@
+`Python::allow_threads` now returns a builder-like object which allows choosing a strategy for running the closure, as the default one which now closes TLS-based soundness loopholes by dispatching the closure to a worker thread has significantly changed performance characteristics.