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The test-no-python-version test was failing because hatchling's dependency on pathspec was incompatible with Python 3.9, causing a TypeError during the build process. Fixed by switching from hatchling to uv_build backend (0.9.22-0.10.0 range) which is fully compatible with Python 3.9. The uv.lock file is updated to reflect the new build backend and latest compatible versions of dependencies.