Free-threaded/noGIL Python 3.13t testing experiment #659
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Hoping that this fixes the issue when installing Python 3.13t on macOS
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This description is a stub and shall be updated soon.
This PR is on top of the changes from #643. Here, I'm trying to test against the free-threaded Python interpreter (Python 3.13t) and nightly wheels for SciPy and NumPy where we have free-threaded. This helps check two items: i. bugs in NumPy and SciPy related to free-threading to report upstream; and ii. whether we have anything of concern in our implementation in case there is nothing to report upstream.
It is to be noted that we are following the approach suggested by https://py-free-threading.github.io here; there is more testing to be done before I can mark this as ready for review: https://py-free-threading.github.io/porting/#validating-thread-safety-with-testing