This patch release contains a soundness fix for subclassing native types such as PyList with the abi3 feature enabled when targeting a minimum version of Python 3.12 or higher. (Support for doing such subclassing was newly added in PyO3 0.28.0.)
PyO3 0.28.0 and 0.28.1 will be yanked.
This release also contains a correction to the FFI definition PyType_GetTypeDataSize and incorrectly-generated __qualname__ on #[pyclass] enum variant types when using #[pyo3(name = "...")] option to rename the enum and/or variant.
Thank you to the following contributors for the improvements: