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NumPy 2.5 allocates with PyMem_RawMalloc, but frees OWNDATA arrays that
have no memory handler with libc free(). The two differ on free-threaded
3.15 (mimalloc) and under PYTHONMALLOC=debug, so matrix.serialize and
binread aborted there.
- claim_buffer attaches NumPy's default memory handler (setup.py sets
NPY_TARGET_VERSION to 1.22 to expose it)
- binread allocates with GraphBLAS's own allocator instead of libc malloc
- add utils.can_unclaim_buffer to check before handing an array's buffer
to GraphBLAS; document unclaim_buffer
- initialize() raises if GraphBLAS fails to initialize
- add tests/test_memory.py (runs in a subprocess with PYTHONMALLOC=debug)
Python 3.15 and maintenance:
- add 3.15 classifier and Black target; test 3.15 rc in CI via the
conda-forge python_rc channel, ranked below conda-forge
- cibuildwheel v3.4 -> v4.2 (builds cp315 and cp315t wheels)
- update all actions and pin them to commit SHAs; group Dependabot
updates with a 7-day cooldown
- least-privilege workflow permissions, cancel superseded PR runs, no
${{ }} expansion inside run: scripts; `bash -el` so a failing command
in a multi-command test step fails the step
- stricter pytest config: warnings are errors, strict markers and config
- update pre-commit hooks; add actionlint, zizmor and pysentry
- rename CLAUDE.md to AGENTS.md and update it
- publish via PyPI Trusted Publishing (environments pypi and test-pypi)
instead of an API token
GraphBLAS (>= 10.4) frees a buffer with its arena's allocator, and NumPy frees an array's data with the array's memory handler. A buffer that crosses between them needs both to agree, or the wrong free aborts (free-threaded 3.15, PYTHONMALLOC=debug) or corrupts memory. - claim_buffer and claim_buffer_2d attach the handler for the buffer's arena (NumPy's default if the arena uses NumPy's allocator, else one that calls the arena's functions); new optional `arena` argument - add give_buffer, a context manager that hands an array (or a copy) to GraphBLAS and commits only if GraphBLAS took it, and empty(), which allocates arrays GraphBLAS can always own - can_unclaim_buffer checks the handler matches the arena; unclaim_buffer raises if the array can't be owned - serialize_* name the result's arena; binread reads into the new matrix's arena and packs with give_buffer, which also fixes iso matrices packed with a full-size Ax_size; binwrite restores the matrix if writing fails - tests fail when NumPy frees an array that has no handler; test_memory covers both memory managers and a libc arena (explicit, global, and Context); doctests run for every api module; wheel tests use -W error - drop stale flake8 ignores; ignore create_headers.py's output
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