python-yarl fails to build with Python 3.15.0a6.

_________________________________ test_pickle __________________________________
[gw0] linux -- Python 3.15.0 /usr/bin/python3

    def test_pickle() -> None:
        u1 = URL("picklepickle")
        hash(u1)
>       v = pickle.dumps(u1)
            ^^^^^^^^^^^^^^^^

u1         = URL('picklepickle')

tests/test_pickle.py:11: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = SplitResult(scheme='', netloc='', path='picklepickle', query='', fragment='')

    def __getstate__(self):
        state = super().__getstate__()
        try:
>           if state[1]['_keep_empty'] == _MISSING_AS_NONE_DEFAULT:
               ^^^^^^^^
E           TypeError: 'NoneType' object is not subscriptable
E           when serializing tuple item 0
E           when serializing yarl.URL state
E           when serializing yarl.URL object

__class__  = <class 'urllib.parse._ResultBase'>
self       = SplitResult(scheme='', netloc='', path='picklepickle', query='', fragment='')
state      = None

/usr/lib64/python3.15/urllib/parse.py:311: TypeError
______________________ test_pickle_does_not_pollute_cache ______________________
[gw0] linux -- Python 3.15.0 /usr/bin/python3

    def test_pickle_does_not_pollute_cache() -> None:
        """Verify the unpickling does not pollute the cache.
    
        Since unpickle will call URL.__new__ with default
        args, we need to make sure that default args never
        end up in the pre_encoded_url or encode_url cache.
        """
        u1 = URL.__new__(URL)
        u1._scheme = "this"
        u1._netloc = "never.appears.any.where.else.in.tests"
        u1._path = ""
        u1._query = ""
        u1._fragment = ""
        hash(u1)
>       v = pickle.dumps(u1)
            ^^^^^^^^^^^^^^^^

u1         = URL('this://never.appears.any.where.else.in.tests')

tests/test_pickle.py:48: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = SplitResult(scheme='this', netloc='never.appears.any.where.else.in.tests', path='', query='', fragment='')

    def __getstate__(self):
        state = super().__getstate__()
        try:
>           if state[1]['_keep_empty'] == _MISSING_AS_NONE_DEFAULT:
               ^^^^^^^^
E           TypeError: 'NoneType' object is not subscriptable
E           when serializing tuple item 0
E           when serializing yarl.URL state
E           when serializing yarl.URL object

__class__  = <class 'urllib.parse._ResultBase'>
self       = SplitResult(scheme='this', netloc='never.appears.any.where.else.in.tests', path='', query='', fragment='')
state      = None

/usr/lib64/python3.15/urllib/parse.py:311: TypeError

https://docs.python.org/3.15/whatsnew/3.15.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.15/fedora-rawhide-x86_64/10144913-python-yarl/

For all our attempts to build python-yarl with Python 3.15, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/package/python-yarl/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.15:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/

Let us know here if you have any questions.

Python 3.15 is planned to be included in Fedora 45.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.15.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.