fix compatible issues in python 3.14#236

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cxzhong wants to merge 22 commits intosagemath:mainfrom

Commits on Oct 1, 2025

Fix Python 3.14 compatibility: Set multiprocessing start method to 'fork'
cxzhong
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Commits on Oct 2, 2025

Fix Python 3.14 compatibility: defer exception raising from signal handlers
cxzhong
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CI: Use specific Python 3.14.0-rc.3 version for testing
cxzhong
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Commits on Oct 3, 2025

Python 3.14: Support forkserver multiprocessing start method
cxzhong
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Fix Python 3.14t free-threaded build: use _Py_REFCNT() instead of ob_refcnt
cxzhong
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Fix Python 3.14t: Use Py_REFCNT declared from Python.h instead of _Py_REFCNT
cxzhong
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Commits on Oct 6, 2025