NumPy 1.21.4 Release Notes

The NumPy 1.21.4 is a maintenance release that fixes a few bugs
discovered after 1.21.3. The most important fix here is a fix for the
NumPy header files to make them work for both x86_64 and M1 hardware
when included in the Mac universal2 wheels. Previously, the header files
only worked for M1 and this caused problems for folks building x86_64
extensions. This problem was not seen before Python 3.10 because there
were thin wheels for x86_64 that had precedence. This release also
provides thin x86_64 Mac wheels for Python 3.10.

The Python versions supported in this release are 3.7-3.10. If you want
to compile your own version using gcc-11, you will need to use gcc-11.2+
to avoid problems.

Contributors

A total of 7 people contributed to this release. People with a "+" by
their names contributed a patch for the first time.

• Bas van Beek
• Charles Harris
• Isuru Fernando
• Matthew Brett
• Sayed Adel
• Sebastian Berg
• 傅立业（Chris Fu） +

Pull requests merged

A total of 9 pull requests were merged for this release.

• #20278: BUG: Fix shadowed reference of dtype in type stub
• #20293: BUG: Fix headers for universal2 builds
• #20294: BUG: VOID_nonzero could sometimes mutate alignment flag
• #20295: BUG: Do not use nonzero fastpath on unaligned arrays
• #20296: BUG: Distutils patch to allow for 2 as a minor version (!)
• #20297: BUG, SIMD: Fix 64-bit/8-bit integer division by a scalar
• #20298: BUG, SIMD: Workaround broadcasting SIMD 64-bit integers on MSVC...
• #20300: REL: Prepare for the NumPy 1.21.4 release.
• #20302: TST: Fix a Arrayterator typing test failure

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