python-pynacl fails to build with updated hypothesis (with Python 3.9.0a6 and 3.8.2).

+ py.test-3 -v
============================= test session starts ==============================
platform linux -- Python 3.9.0a6, pytest-4.6.9, py-1.8.0, pluggy-0.13.0 -- /usr/bin/python3
cachedir: .pytest_cache
hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('/builddir/build/BUILD/pynacl-1.3.0/.hypothesis/examples')
rootdir: /builddir/build/BUILD/pynacl-1.3.0
plugins: hypothesis-5.10.4
collecting ... collected 4443 items / 2 errors / 4441 selected

==================================== ERRORS ====================================
_____________________ ERROR collecting tests/test_aead.py ______________________
ImportError while importing test module '/builddir/build/BUILD/pynacl-1.3.0/tests/test_aead.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests/test_aead.py:21: in <module>
    from hypothesis import given, settings, unlimited
E   ImportError: cannot import name 'unlimited' from 'hypothesis' (/usr/lib/python3.9/site-packages/hypothesis/__init__.py)
____________________ ERROR collecting tests/test_pwhash.py _____________________
ImportError while importing test module '/builddir/build/BUILD/pynacl-1.3.0/tests/test_pwhash.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests/test_pwhash.py:23: in <module>
    from hypothesis import given, settings, unlimited
E   ImportError: cannot import name 'unlimited' from 'hypothesis' (/usr/lib/python3.9/site-packages/hypothesis/__init__.py)
!!!!!!!!!!!!!!!!!!! Interrupted: 2 errors during collection !!!!!!!!!!!!!!!!!!!!
=========================== 2 error in 1.11 seconds ============================

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01365574-python-pynacl/

For all our attempts to build python-pynacl with Python 3.9, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/package/python-pynacl/

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 3.9:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/

Let us know here if you have any questions.

Python 3.9 will be included in Fedora 33. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.9.
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.