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Add `pytest-run-parallel` as dependency, test no-GIL interpreters in CI, and mark Cython module as safe for freethreaded interpreters.
Co-authored-by: Lysandros Nikolaou <[email protected]>
On Windows, attempting to upgrade `pip` within CI always yields this: ``` Run pip install -U pip Requirement already satisfied: pip in c:\hostedtoolcache\windows\python\3.10.11\x64\lib\site-packages (25.1.1) Collecting pip Downloading pip-25.2-py3-none-any.whl.metadata (4.7 kB) Downloading pip-25.2-py3-none-any.whl (1.8 MB) ---------------------------------------- 1.8/1.8 MB 48.1 MB/s eta 0:00:00 Notice: A new release of pip is available: 25.1.1 -> 25.2 Notice: To update, run: python.exe -m pip install --upgrade pip ERROR: To modify pip, please run the following command: C:\hostedtoolcache\windows\Python\3.10.11\x64\python.exe -m pip install -U pip Error: Process completed with exit code 1. ```
Co-authored-by: Frank Dana <[email protected]>
Co-authored-by: Frank Dana <[email protected]>
Per msgpack#641 (comment), sharing more than one `Packer` object is not supported.
``` $ v3/bin/python -VV Python 3.14.0 free-threading build (main, Oct 7 2025, 15:35:12) [Clang 20.1.4 ] $ v3/bin/python -c 'import sys,msgpack; print(sys._is_gil_enabled())' False ```
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