Tests failing on ppc64le

I am packaging libtmux for openSUSE. Unfortunately the tests fail on ppc64le. Could you have a look if this can be fixed?

[   82s] =================================== FAILURES ===================================
[   82s] ___________________ test_function_times_out_no_raise_assert ____________________
[   82s] 
[   82s]     def test_function_times_out_no_raise_assert() -> None:
[   82s]         ini = time()
[   82s]     
[   82s]         def never_true() -> bool:
[   82s]             return False
[   82s]     
[   82s]         assert not retry_until(never_true, 1, raises=False)
[   82s]     
[   82s]         end = time()
[   82s]     
[   82s] >       assert abs((end - ini) - 1.0) < 0.01
[   82s] E       assert 0.012233734130859375 < 0.01
[   82s] E        +  where 0.012233734130859375 = abs(((1679485925.7025032 - 1679485924.6902695) - 1.0))
[   82s] 
[   82s] tests/test_test.py:67: AssertionError
[   82s] _______________________ test_function_times_out_no_rise ________________________
[   82s] 
[   82s]     def test_function_times_out_no_rise() -> None:
[   82s]         ini = time()
[   82s]     
[   82s]         def never_true() -> bool:
[   82s]             return False
[   82s]     
[   82s]         retry_until(never_true, 1, raises=False)
[   82s]     
[   82s]         end = time()
[   82s]     
[   82s] >       assert abs((end - ini) - 1.0) < 0.01
[   82s] E       assert 0.013442516326904297 < 0.01
[   82s] E        +  where 0.013442516326904297 = abs(((1679485936.5801134 - 1679485935.566671) - 1.0))
[   82s] 
[   82s] tests/legacy_api/test_test.py:54: AssertionError

Start by running the failing tests in tests/test_test.py and tests/legacy_api/test_test.py on ppc64le, focusing on the retry_until timeout assertions shown in the report. Check how the timing tolerance behaves on that platform; done means the tests pass there while still verifying the intended one-second timeout behavior.