python-dispatch v0.2.2 is incompatible with Python 3.14

[pwt]

New issue starting with Python 3.14:

Reproducer (x.py):

from pydispatch import Dispatcher
print("Done!")

Output:

$ python x.py 
Traceback (most recent call last):
  File "/home/ubuntu/x.py", line 1, in <module>
    from pydispatch import Dispatcher
  File "/home/ubuntu/venv/lib/python3.14/site-packages/pydispatch/__init__.py", line 18, in <module>
    from pydispatch.dispatch import *
  File "/home/ubuntu/venv/lib/python3.14/site-packages/pydispatch/dispatch.py", line 10, in <module>
    from pydispatch.aioutils import AioWeakMethodContainer, AioEventWaiters
  File "/home/ubuntu/venv/lib/python3.14/site-packages/pydispatch/aioutils.py", line 4, in <module>
    from _weakrefset import _IterationGuard
ImportError: cannot import name '_IterationGuard' from '_weakrefset' (/home/ubuntu/.local/share/uv/python/cpython-3.14.0-linux-x86_64-gnu/lib/python3.14/_weakrefset.py)

This is the PR that removed _IterationGuard: python/cpython#125325

[pwt]

If the _IterationGuard class is defined locally in aioutils.py instead of imported, there are still lots of test failures:

% pytest -n auto
...
================================================================================================= short test summary info =================================================================================================
FAILED tests/test_aio_listeners.py::test_changes_during_emit - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_events.py::test_cls_events - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_unbind[True] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_events.py::test_removal - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_events.py::test_function_listener - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_global_dispatcher.py::test_decorator_async_cache - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_simple[True] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_multiple_loops[True] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_event_await[True] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_global_dispatcher.py::test_receiver_decorator - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_global_dispatcher.py::test_receiver_decorator_unregistered_auto_register - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_lock.py::test_aio_property_lock - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_global_dispatcher.py::test_receiver_decorator_unregistered_cache - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_events.py::test_unbind - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_lock.py::test_aio_event_lock - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_events.py::test_emission_lock - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_events.py::test_bind_during_emit - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_unbind[False] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_global_dispatcher.py::test_receiver_decorator_registered_auto_register - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_simple[False] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_global_dispatcher.py::test_receiver_decorator_registered_cache - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_multiple_loops[False] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_global_dispatcher.py::test_decorator_async_auto_register - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_properties - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_container_properties - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_list_property_ops - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_subclass_init.py::test_new_class_creation - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_aio_listeners.py::test_event_await[False] - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED pydispatch/properties.py::pydispatch.properties - 017     ...     def on_foo_name(self, instance, value, **kwargs):
FAILED tests/test_aio_lock.py::test_aio_lock_concurrency - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_empty_defaults - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_unbind - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED doc/source/global-dispatcher.rst::global-dispatcher.rst - 023 
FAILED doc/source/dispatcher.rst::dispatcher.rst - 023     ...         print('emitter state changed')
FAILED pydispatch/dispatch.py::pydispatch.dispatch.Dispatcher.bind - 203     >>> class Bar(object):
FAILED tests/test_properties.py::test_self_binding - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED pydispatch/dispatch.py::pydispatch.dispatch.Dispatcher.emission_lock - 343 
FAILED pydispatch/decorators.py::pydispatch.decorators.receiver - 043 
FAILED doc/source/properties.rst::properties.rst - 030     ...         print('emitter value is {}'.format(value))
FAILED tests/test_properties.py::test_dict_property_ops - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_emission_lock - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_removal - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED tests/test_properties.py::test_copy_on_change - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'
FAILED doc/source/async.rst::async.rst - 043     ...         await self.event_received.wait()
FAILED tests/test_events.py::test_basic - AttributeError: 'AioWeakMethodContainer' object has no attribute '_iterating'