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**Release**: 2024-10-24
* ``PriorityCallback`` now has type checking support, similar to ``Callback``, with type checked variants: ``PriorityCallback0``, ``PriorityCallback1``, etc (`128`_).
* ``UnregisterContext`` is now public, meant to be used in type annotations.
* Python 3.10+ is now required.
.. _128: https://github.com/ESSS/oop-ext/pull/128