v3.1.4

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Features added

• Declarations for the new PyUnstable_*() refcounting C-API functions in Py3.14 were added.
  (Github issue :issue:6836)

Bugs fixed

• The monitoring code could crash on tracing.
  (Github issue :issue:7050)

• Initialising the monitoring code could fail with a CPython exception.
  See nedbat/coveragepy#1790 (comment)

• Optimised integer shifting triggered undefined behaviour in C.
  (Github issue :issue:7089)

• Deallocating objects that inherit from external types defined in pxd files
  could run into an infinite loop.
  (Github issue :issue:7143)

• A reference to metaclasses could be leaked on instantiation.
  (Github issue :issue:7130)

• (Unlikely) error handling during empty builtin container tests was ineffective.
  (Github issue :issue:7190)

• Generated *_api.h files used potentially unknown Cython configuration macros.
  (Github issue :issue:7108)

• cythonize() avoids parallel compiler runs on systems using spawn() in multiprocessing.
  Patch by Marcel Bargull. (Github issue :issue:3262)

• The @cython.ufunc decorator was missing in type checker stubs.
  Patch by jayClean. (Github issue :issue:7109)

v3.1.3

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Bugs fixed

• Some method calls with 0 or 1 argument failed to use PyObject_VectorCallMethod().

• Walrus assignments of literal Python integers could generate invalid C code.
  (Github issue :issue:6989)

• cython.pythread_type_lock (also used as fallback for cython.pymutex)
  could stall on heavily contended locks.
  (Github issue :issue:6999)

• C string arrays (not pointers) always coerced to the Python default string type,
  even on explicit casts to other string types.
  (Github issue :issue:7020)

• Unterminated \N{} character escapes in strings could unrail the parser.
  (Github issue :issue:7056)

• An internal C function was not marked as static and leaked a linker symbol.
  (Github issue :issue:6957)

• Some Unicode letters were not recognised as lexically valid name parts.
  (Github issue :issue:7059)

• Compatibility with PyPy3.8 was lost by accident.

• The Linux binary wheels of 3.1.2 used SSSE3 CPU instructions which are not available on some CPUs.
  (Github issue :issue:7038)

v3.1.2

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Bugs fixed

• Attribute lookups failed on the bool builtin type.
  (Github issue :issue:6905)

• Type checks on or-ed union types could incorrectly return false.
  (Github issue :issue:6420)

• Negative list indexing could accidentally wrap around twice in PyPy and the Limited API.

• Iterating over literal sequences with starred (unpacked) items could infer a wrong
  type for the loop variable and fail to assign the values.
  (Github issue :issue:6924)

• Calls to C functions taking exception types failed to check for a None argument.
  (Github issue :issue:6420)

• Fused functions had an incorrect __module__ attribute.
  (Github issue :issue:6897)

• The type of Cython implemented functions had an incorrect __module__ attribute.
  (Github issue :issue:6841)

• Errors while indexing into bytearray or str in nogil sections could crash.
  (Github issue :issue:6947)

• bytearray.append() could silently accept some invalid character numbers.

• The C++11 <type_traits> header was included regardless of the C++ version.
  (Github issue :issue:6896)

• PyDict_GetItemStringRef() was accidentally used in older Limited API versions.
  (Github issue :issue:6914)

• abort() was used but not always available in the Limited API.
  (Github issue :issue:6918)

• Some dependencies were missing from the depfile.
  (Github issue :issue:6938)

• Embedded function signatures were not always separated from the existing docstring.
  (Github issue :issue:6904)

• numpy.math was missing from Cython/Includes/ and could not be cimported.
  (Github issue :issue:6859)

• Some tests were adapted for NumPy 2.x.
  (Github issue :issue:6898)

• Some C compiler warnings were fixed.
  (Github issue :issue:6870)

• Cython.Build was not officially exposing the cythonize function.
  (Github issue :issue:6934)

v3.1.1

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Bugs fixed

• A reference leak in the async delegation code was fixed.
  (Github issues :issue:6850, :issue:6878)

• Conditional if-else expressions mixing Python and C (numeric) types could end up
  inferring an overly tight result type, thus leading to unexpected type conversions,
  runtime exceptions on assignment, or incorrect "temporary assignment" compile errors.
  (Github issue :issue:6854)

• Some Limited API issues were resolved.
  (Github issue :issue:6862)

• Large C long long values could be truncated when passed into PyPy.
  (Github issue :issue:6890)

• callable() incorrectly reported False in PyPy for classes with metaclasses.
  Patch by Anatolii Aniskovych. (Github issue :issue:6892)

• The signature of fused functions was no longer introspectable in Cython 3.1.0.
  (Github issue :issue:6855)

• Coroutines could generate invalid C with line tracing enabled.
  (Github issue :issue:6865)

• Code using complex() could generate invalid C code missing type declarations.
  (Github issue :issue:6860)

• Code using e.g. list[int | None] outside of variable/argument annotations failed to compile.
  (Github issue :issue:6856)

• Code using ctuples in a const context could generate invalid C.
  (Github issue :issue:6864)

• Accessing special methods on cpdef enums failed to compile.

• Some C compiler warnings were resolved.
  Patches by Daniel Larraz. (Github issues :issue:6876, :issue:3172, :issue:6873, :issue:6877)

• Re-establish support for PyPy 3.8.
  (Github issue :issue:6867)

v3.1.0

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Other changes

• No functional changes since 3.1.0 rc 2.