`test_bntr[start_vec3-cg]` fails on Linux with Python 3.10

[r3kste]

Bug description

The test tests/optimagic/optimizers/test_pounders_integration.py::test_bntr[start_vec3-cg] has started to fail on Linux environments with Python 3.10. It is temporarily skipped in #656, specifically in 83eac8d.

To Reproduce

Run this test in a fresh Python 3.10 environment on Linux

pytest tests/optimagic/optimizers/test_pounders_integration.py::test_bntr

On CI, the test fails with:

FAILED tests/optimagic/optimizers/test_pounders_integration.py::test_bntr[start_vec3-cg] - AssertionError: 
Arrays are not almost equal to 3 decimals

Mismatched elements: 3 / 3 (100%)
Max absolute difference among violations: 0.1969519
Max relative difference among violations: 1.03506949
 ACTUAL: array([-0.007,  0.003,  0.019])
 DESIRED: array([0.19 , 0.006, 0.011])

On my local environment, the test fails with:

FAILED tests/optimagic/optimizers/test_pounders_integration.py::test_bntr[start_vec3-cg] - AssertionError: 
Arrays are not almost equal to 3 decimals

Mismatched elements: 1 / 3 (33.3%)
Max absolute difference among violations: 0.00179793
Max relative difference among violations: 0.00944892
 ACTUAL: array([0.188, 0.006, 0.011])
 DESIRED: array([0.19 , 0.006, 0.011])

Expected behavior

All five test cases should pass. Currently, only one test case fails.

System

• OS: Linux
• Python version: 3.10
• optimagic version: latest (dev)

[spline2hg]

The same test now also fails on Linux with Python 3.11, 3.12, 3.13.

As a temporary workaround, the test has been skipped on Ubuntu for Python ≥ 3.10.

Python 3.13 environment CI logs:

E       AssertionError: 
E       Arrays are not almost equal to 3 decimals
E       
E       Mismatched elements: 2 / 3 (66.7%)
E       Max absolute difference among violations: 0.07524246
E       Max relative difference among violations: 0.39543249
E        ACTUAL: array([0.115, 0.005, 0.013])
E        DESIRED: array([0.19 , 0.006, 0.011])