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https://hydra.nixos.org/build/299109156 Per the release notes: https://docs.python.org/3/whatsnew/3.13.html > Remove the PyEval_ThreadsInitialized() function, deprecated in Python 3.9. Since Python 3.7, Py_Initialize() always creates the GIL: calling PyEval_InitThreads() does nothing and PyEval_ThreadsInitialized() always returns non-zero.