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Fixed a memory-safety race condition resulting in segmentation faults (Use-After-Free) when iterating and modifying a ``MultiDict`` concurrently in CPython free-threaded mode (3.13t+). Read/Write accesses to the internal ``keys`` buffer are now wrapped in ``Py_BEGIN_CRITICAL_SECTION``.
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Fixed a memory-safety race condition resulting in segmentation faults (Use-After-Free) when iterating and modifying a ``MultiDict`` concurrently in CPython free-threaded mode (3.13t+). Read/Write accesses to the internal ``keys`` buffer are now wrapped in ``Py_BEGIN_CRITICAL_SECTION``
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