This failure comes from python-cramjam which fails to build with Python 3.14.0a2.

Given the sole import of the hypothesis object causes a test failure, I'm inclined to assign this to hypothesis first. We've built it without tests so far.

____________ test_variants_decompress_into[snappy-memoryview-numpy] ____________
[gw1] linux -- Python 3.14.0 /usr/bin/python3

variant_str = 'snappy', input_type = 'numpy', output_type = <class 'memoryview'>
tmp_path_factory = TempPathFactory(_given_basetemp=PosixPath('/tmp/pytest-of-mockbuild/pytest-0/popen-gw1'), _trace=<pluggy._tracing.TagT...f6f0>, _basetemp=PosixPath('/tmp/pytest-of-mockbuild/pytest-0/popen-gw1'), _retention_count=3, _retention_policy='all')
is_pypy = False

    @pytest.mark.parametrize(
>       "input_type", (bytes, bytearray, "numpy", cramjam.Buffer, cramjam.File, memoryview)

tests/test_variants.py:145: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.14/site-packages/hypothesis/internal/conjecture/engine.py:754: in run
    self._run()
/usr/lib/python3.14/site-packages/hypothesis/internal/conjecture/engine.py:1216: in _run
    self.generate_new_examples()
/usr/lib/python3.14/site-packages/hypothesis/internal/conjecture/engine.py:1062: in generate_new_examples
    self.optimise_targets()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <hypothesis.internal.conjecture.engine.ConjectureRunner object at 0x7f328f42ae90>

    def optimise_targets(self) -> None:
        """If any target observations have been made, attempt to optimise them
        all."""
        if not self.should_optimise:
            return
>       from hypothesis.internal.conjecture.optimiser import Optimiser
E         File "/usr/lib/python3.14/site-packages/hypothesis/internal/conjecture/optimiser.py", line 43
E           self.improvements = 0
E       SyntaxError: could not convert string to float: 'R' - Consider hexadecimal for huge integer literals to avoid decimal conversion limits.

/usr/lib/python3.14/site-packages/hypothesis/internal/conjecture/engine.py:1169: SyntaxError
---------------------------------- Hypothesis ----------------------------------
You can add @seed(212344181825535987951636017873018613235) to this test or run pytest with --hypothesis-seed=212344181825535987951636017873018613235 to reproduce this failure.



This report is automated and not very verbose, but we'll try to get back here with details.

https://docs.python.org/3.14/whatsnew/3.14.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08291308-python-cramjam/

For all our attempts to build python-cramjam with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/python-cramjam/

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 3.14:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/

Let us know here if you have any questions.

Python 3.14 is planned to be included in Fedora 43.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14.
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.