Update dependency cython to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
cython (source)	<3.0 -> <3.3

---

Release Notes

cython/cython (cython)

v3.2.1

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Features added

• Cython now leaves markers about its utility code dependencies in the generated C code
  to help debugging "unused function" C compiler warnings.
  (Github issue :issue:7294)

Bugs fixed

• Relative imports could fail if the shared utility module is used.
  This bug was introduces in Cython 3.2.0.
  (Github issue :issue:7290)

• Under lock congestion, acquiring the GIL could crash in Python 3.11.
  This bug was introduces in Cython 3.2.0.
  (Github issue :issue:7312)

• Using the shared utility module left an unused C function in user modules with memoryviews.
  To make debugging this kind of issue easier, Cython now leaves "used by …" markers in the
  generated C files that indicate why a specific piece of utility code was included.
  This bug was introduces in Cython 3.2.0.
  (Github issue :issue:7293)

• Code using the pre-import scope failed with an undefined name.
  This bug was introduces in Cython 3.2.0.
  (Github issue :issue:7304)

• Includes all fixes as of Cython 3.1.7.

v3.2.0

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==================

(Complete changelog for the 3.2.0 release, including pre-releases.)

Features added

• Builtin exception types are now inferred.
  (Github issue :issue:6908)

• The list of known, inferred and optimised Python builtins was updated.
  range is now considered a type. ascii, bin, format, hex, oct were added as functions.
  (Github issue :issue:6931)

• The f-string syntax was extended according to PEP-701.
  (Github issue :issue:5452)

• t-strings are implemented according to PEP-750. The implementation backports the template classes
  but prefers existing backports if installed separately.
  (Github issue :issue:6811)

• Unknown return type annotations with -> are no longer rejected but produce warnings.
  This allows better integration with Python type hints that are not always usable for Cython.
  -> None is also allowed now.
  Patch by jpe. (Github issue :issue:6946)

• The runtime Python dispatch for fused functions is substantially faster.
  (Github issues :issue:1385, :issue:6996)

• Freelists (via cdef class decorator and for internally used types such as async)
  are now also used in the Limited API and with extension type specs enabled.
  (Github issue :issue:7151)

• Module imports now quickly check for an already imported module to speed up reimports.
  Patch by Lysandros Nikolaou. (Github issue :issue:7035)

• Type checks on PEP-604 union types (int | None) are optimised into separate checks.
  (Github issue :issue:6935)

• Assignments to the PEP-604 union type float | None allow any suitable Python number as input
  and convert it to a Python float automatically.
  (Github issue :issue:5750)

• Item type inference was improved for looping over literals.
  (Github issue :issue:6912)

• Looping over literal sequences and strings now uses efficient C array looping if possible.
  (Github issue :issue:6926)

• Releasing the GIL from an unknown lock state is more efficient.
  (Github issue :issue:6847)

• cython.critical_section(PyMutex) now works, as with Python objects.
  (Github issue :issue:6847)

• bool(c_int/float/ptr) avoid passing through Python objects.
  (Github issue :issue:7015)

• Variables assigned inside of prange loops can now be initialised outside of the loop.
  (Github issue :issue:7178)

• Unused exceptions in except clauses are detected in some more cases to avoid their normalisation.
  (Github issue :issue:7021)

• Mixed operations on C integers with Python ints use less code and are more streamlined for Py3.12+.
  (Github issue :issue:7244)

• Some object constants are now marked as immortal to speed up their reference counting
  in recent CPython versions. This can be configured with the CYTHON_IMMORTAL_CONSTANTS C macro.
  (Github issue :issue:7118)

• Further improvements were made to reduce the size of the resulting extension modules.
  (Github issue :issue:6983, :issue:7199, :issue:7220, :issue:7238,
  :issue:7255, :issue:7265)

• Several improvements were made in freethreaded Python code.
  (Github issues :issue:6936, :issue:6939, :issue:6949, :issue:6984,
  :issue:7011, :issue:7066, :issue:7114, :issue:7200)

• Several improvements were made for the Limited API.
  (Github issues :issue:6959, :issue:6991)

• Several improvements were made for the GraalPython support.
  Patch by Michael Šimáček. (Github issue :issue:7074)

• Some GIL-safe C-API wrappers were added to the libc/libcpp declarations.
  (Github issue :issue:6829, :issue:6993)

• String and number constants use less storage space in the module.
  (Github issues :issue:6971, :issue:6978, :issue:6986)

• The managed dict/weakref support in CPython 3.12+ is used for internal types
  to benefit from future CPython optimisations here.
  (Github issue :issue:6891)

• Using NaN as exception return value is supported.
  (Github issues :issue:6900, :issue:6903)

• Declarations for C++ condition variables were added.
  (Github issue :issue:6836)

• The annotated source HTML page shows alternating +/− markers to open/close lines.
  Patch by Kamil Monicz. (Github issue :issue:7099)

• cython --embed gained a new option --embed-modules=… to list further extension modules
  that will be statically linked into the generated extension module, to get them initialised
  on application start.
  (Github issue :issue:2849)

• The setup.py script of Cython now allows passing the desired Limited API version
  like --cython-limited-api=3.11.
  (Github issue :issue:7228)

• Unicode 16.0.0 is used to parse identifiers.
  (Github issue :issue:6836)

Bugs fixed

• Special float exception values could generate invalid C code.
  (Github issues :issue:6900, :issue:6903)

• References to the Python bool type could generate invalid C code.
  (Github issue :issue:6902)

• Using cython.pymutex in an extension type declared as public or api
  generated invalid C code missing the required PyMutex declarations.
  (Github issues :issue:6992, :issue:6995)

• Cython's type sharing across modules suffered from race conditions if multiple modules
  tried to initialise and share their types concurrently. This is due to an underlying
  CPython issue and cannot easily be worked around completely. In the common case that
  module dicts are plain Python dict objects, however, Cython now uses a .setdefault()
  equivalent for thread-safe type sharing.
  See python/cpython#137422
  (Github issue :issue:7076)

• Cython incorrectly called PyList_GetItemRef() in PyPy and GraalPython before Py3.13.
  (Github issue :issue:7269)

• Iterating over temporary memoryviews could crash Cython.
  (Github issue :issue:7005)

• Type casts on constants as part of numeric expressions could crash Cython.
  (Github issue :issue:6779)

• Long code bodies in with statements could crash Cython.
  (Github issue :issue:7122)

• Vectorcalls could use needless temp assignments for self.
  (Github issue :issue:6909)

• Indexing bytes failed to optimise in some cases.
  (Github issue :issue:6997)

• Optimised C integer formatting in f-strings failed to apply to typedef types.
  (Github issue :issue:7170)

• In auto-pickling, trying to unpickle an object that has no __dict__ from object pickle data
  that includes instance dict state is now an error.
  (Github issue :issue:7222)

• The type objects of heap types were not always correctly decrefed on deallocation.
  (Github issue :issue:7145)

• Pure mode type aliases like p_int or ulong leaked into some C type contexts,
  risking to conflict with user declarations.
  (Github issues :issue:6922, :issue:6339)

• Boolean (emptyness) tests on builtin containers could fail to handle (unlikely) errors.
  (Github issue :issue:7090)

• The return type of bytes.join() was sometimes inferred as plain object.
  (Github issue :issue:6987)

• Type inference could fail to understand prange() arguments.
  (Github issue :issue:6974)

• embedsignatures failed if lambda was used in function default arguments.
  (Github issue :issue:6880)

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

• PyType_FromModuleAndSpec was incorrectly used in Limited API code before Py3.10.
  (Github issue :issue:7181)

• Conversion code for memoryview dtypes from and to Python objects generated C warnings about
  incorrect const / non-const casting code.
  (Github issue :issue:7219)

• Cython's tools and frontend scripts now use python3 instead of just python
  in their shebang line.
  Patch by Matti Picus. (Github issue :issue:7053)

• Extension arguments defined for the shared code module were ignored in cythonize().
  (Github issue :issue:7251)

• Failures while following package attributes in import pkg.module as … were not handled.

• Trying to instantiate internal types used by Cython is now prohibited.
  (Github issue :issue:7263)

• The setup.py script in the Demos/ subdirectory failed to build.
  (Github issue :issue:7228)

• The cygdb program failed to work with virtualenvs on Windows.
  Patch by Merlin. (Github issue :issue:7268)

• Includes all fixes as of Cython 3.1.6.

Other changes

• Some lesser used platforms (Windows ARM/i686, macOS x86_64, Linux i686, musllinux)
  now use Py3.9 abi3 binary wheels instead of Python version specific wheels.
  We also added an abi3 wheel for armv7l.
  (Github issues :issue:7227, :issue:7248, :issue:7250)

• Usages of Py_TPFLAGS_HAVE_FINALIZE were removed. The constant remains available as cimport from
  cpython.object for legacy reasons.
  (Github issue :issue:6423)

v3.1.7

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Bugs fixed

• Unicode characters formatted from C integers with padding, as in f"{value:XXc}",
  could result in invalid Python string objects since Cython 3.1.0.
  Also, lone surrogates failed to format in this way.
  (Github issue :issue:7298)

• Assigning nested structs from a list of structs (item by item) could crash Cython.
  (Github issue :issue:7308)

• Cython incorrectly called PyList_GetItemRef() in PyPy and GraalPython before Py3.13.
  (Github issue :issue:7269)

• Trying to instantiate internal types used by Cython is now prohibited.
  (Github issue :issue:7263)

v3.1.6

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Bugs fixed

• Unicode characters formatted from C integers with f"{value:c}" could result in
  invalid Python string objects since Cython 3.1.0.
  (Github issue :issue:7240)

• cythonize (program and function) now uses concurrent.futures.ProcessPoolExecutor
  instead of multiprocessing.Pool to fix a hang on build failures in parallel builds.
  A possible work-around is to disable parallel builds.
  Patch by Sviatoslav Sydorenko. (Github issue :issue:7183)

v3.1.5

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Bugs fixed

• Conversion from C++ strings longer than PY_SSIZE_T_MAX did not validate the length.

• Some non-Limited API code was incorrectly used in generated header files.
  (Github issue :issue:7157)

• Optimised unpacking of Python integers in expressions uses a slightly safer scheme.
  (Github issue :issue:7134)

• Empty return statements were not always reported when tracing.
  (Github issue :issue:7022)

• Value conversion errors when tracing C return statements no longer fail the trace
  but fall back to reporting None returns instead.
  (Github issue :issue:6503)

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.

v3.0.12

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Bugs fixed

• Release 3.0.11 introduced some incorrect noexcept warnings.
  (Github issue :issue:6335)

• Conditional assignments to variables using the walrus operator could crash.
  (Github issue :issue:6094)

• Dict assignments to struct members with reserved C names could generate invalid C code.

• Fused ctuples with the same entry types but different sizes could fail to compile.
  (Github issue :issue:6328)

• In Py3, pyximport was not searching sys.path when looking for importable source files.
  (Github issue :issue:5615)

• Using & 0 on integers produced with int.from_bytes() could read invalid memory on Python 3.10.
  (Github issue :issue:6480)

• Modules could fail to compile in PyPy 3.11 due to missing CPython specific header files.
  Patch by Matti Picus. (Github issue :issue:6482)

• Minor fix in C++ partial_sum() declaration.

v3.0.11

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Features added

• The C++11 emplace* methods were added to libcpp.deque.
  Patch by Somin An. (Github issue :issue:6159)

Bugs fixed

• The exception check value of functions declared in pxd files was not always applied in 3.0.10.
  (Github issue :issue:6122)

• A crash on exception deallocations was fixed.
  (Github issue :issue:6022)

• A crash was fixed when assigning a zero-length slice to a memoryview.
  Patch by Michael Man. (Github issue :issue:6227)

• libcpp.optional.value() could crash if it raised a C++ exception.
  Patch by Alexander Condello. (Github issue :issue:6190)

• The return type of str() was mishandled, leading to crashes with language_level=3.
  (Github issue :issue:6166)

• bytes.startswith/endswith() failed for non-bytes substrings (e.g. bytearray).
  (Github issue :issue:6168)

• Fused ctuples crashed Cython.
  (Github issue :issue:6068)

• A compiler crash was fixed when using extension types in fused types.
  (Github issue :issue:6204)

• The module cleanup code was incorrect for globally defined memory view slices.
  (Github issue :issue:6276)

• Some adaptations were made to enable compilation in Python 3.13.
  (Github issues :issue:5997, :issue:6182, :issue:6251)

v3.0.10

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Bugs fixed

• Cython generated incorrect self-casts when directly calling final methods of subtypes.
  Patch by Lisandro Dalcin. (Github issue :issue:2747)

• Internal C names generated from C function signatures could become too long for MSVC.
  (Github issue :issue:6052)

• The noexcept warnings could be misleading in some cases.
  Patch by Gonzalo Tornaría. (Github issue :issue:6087)

• The @cython.ufunc implementation could generate incomplete C code.
  (Github issue :issue:6064)

• The libcpp.complex declarations could result in incorrect C++ code.
  Patch by Raffi Enficiaud. (Github issue :issue:6037)

• Several tests were adapted to work with both NumPy 1.x and 2.0.
  Patch by Matti Picus. (Github issues :issue:6076, :issue:6100)

• C compiler warnings when the freelist implementation is disabled (e.g. on PyPy) were fixed.
  It can now be disabled explicitly with the C macro guard CYTHON_USE_FREELISTS=0.
  (Github issue :issue:6099)

• Some C macro guards for feature flags were missing from the NOGIL Python configuration.

• Some recently added builtins were unconditionally looked up at module import time
  (if used by user code) that weren't available on all Python versions and could thus
  fail the import.

• A performance hint regarding exported pxd declarations was improved.
  (Github issue :issue:6001)

v3.0.9

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Features added

• Assigning const values to non-const variables now issues a warning.
  (Github issue :issue:5639)

• Using noexcept on a function returning Python objects now issues a warning.
  (Github issue :issue:5661)

• Some C-API usage was updated for the upcoming CPython 3.13.
  Patches by Victor Stinner et al. (Github issues :issue:6003, :issue:6020)

• The deprecated Py_UNICODE type is no longer used, unless required by user code.
  (Github issue :issue:5982)

• std::string.replace() declarations were added to libcpp.string.
  Patch by Kieran Geary. (Github issue :issue:6037)

Bugs fixed

• Cython generates incorrect (but harmless) self-casts when directly calling
  final methods of subtypes. Lacking a better solution, the errors that recent
  gcc versions produce have been silenced for the time being.
  Original patch by Michał Górny. (Github issue :issue:2747)

• Unused variable warnings about clineno were fixed when C lines in tracebacks are disabled.
  (Github issue :issue:6035)

• Subclass deallocation of extern classes could crash if the base class uses GC.
  Original patch by Jason Fried. (Github issue :issue:5971)

• Type checks for Python memoryview could use an invalid C function.
  Patch by Xenia Lu. (Github issue :issue:5988)

• Calling final fused functions could generate invalid C code.
  (Github issue :issue:5989)

• Declaring extern enums multiple times could generate invalid C code.
  (Github issue :issue:5905)

• pyximport used relative paths incorrectly.
  Patch by Stefano Rivera. (Github issue :issue:5957)

• Running Cython with globbing characters ([]*?) in the module search path could fail.
  Patch by eewanco. (Github issue :issue:5942)

• Literal strings that include braces could change the C code indentation.

Other changes

• The "enum class not importable" warning is now only issued once per enum type.
  (Github issue :issue:5941)

v3.0.8

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Bugs fixed

• Using const together with defined fused types could fail to compile.
  (Github issue :issue:5230)

• A "use after free" bug was fixed in parallel sections.
  (Github issue :issue:5922)

• Several types were not available as cython.* types in pure Python code.

• The generated code is now correct C89 again, removing some C++ style // comments
  and C99-style declaration-after-code code ordering. This is still relevant for some
  ols C compilers, specifically ones that match old Python 2.7 installations.

v3.0.7

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Bugs fixed

• In the iterator of generator expressions, await and yield were not correctly analysed.
  (Github issue :issue:5851)

• cpdef enums with the same name cimported from different modules could lead to
  invalid C code.
  (Github issue :issue:5887)

• Some declarations in cpython.unicode were fixed and extended.
  (Github issue :issue:5902)

• Compiling fused types used in pxd files could crash Cython in Python 3.11+.
  (Github issues :issue:5894, :issue:5588)

• Source files with non-ASCII file names could crash Cython.
  (Github issue :issue:5873)

• Includes all bug-fixes and features from the 0.29 maintenance branch
  up to the :ref:0.29.37 release.

v3.0.6

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Features added

• Fused def function dispatch is a bit faster.

• Declarations for the wchar PyUnicode API were added.
  (Github issue :issue:5836)

• The Python "nogil" fork is now also detected with the new Py_GIL_DISABLED macro.
  Patch by Hugo van Kemenade. (Github issue :issue:5852)

Bugs fixed

• Comparing dataclasses could give different results than Python.
  (Github issue :issue:5857)

• float(std::string) generated invalid C code.
  (Github issue :issue:5818)

• Using cpdef functions with cimport_from_pyx failed.
  (Github issue :issue:5795)

• A crash was fixed when string-formatting a Python value fails.
  (Github issue :issue:5787)

• On item access, Cython could try the sequence protocol before the mapping protocol
  in some cases if an object supports both.
  (Github issue :issue:5776)

• A C compiler warning was resolved.
  (Github issue :issue:5794)

• Complex numbers failed to compile in MSVC with C11.
  Patch by Lysandros Nikolaou. (Github issue :issue:5809)

• Some issues with the Limited API and with PyPy were resolved.
  (Github issues :issue:5695, :issue:5696)

• A C++ issue in Python 3.13 was resolved.
  (Github issue :issue:5790)

• Several directives are now also available (as no-ops) in Python code.
  (Github issue :issue:5803)

• An error message was corrected.
  Patch by Mads Ynddal. (Github issue :issue:5805)

v3.0.5

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Features added

• Preliminary support for CPython 3.13a1 was added to allow early testing.
  (Github issue :issue:5767)

Bugs fixed

• A compiler crash was fixed.
  (Github issue :issue:5771)

• A typo in the always_allow_keywords directive for Python code was fixed.
  Patch by lk-1984. (Github issue :issue:5772)

• Some C compiler warnings were resolved.
  Patch by Pierre Jolivet. (Github issue :issue:5780)

v3.0.4

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Features added

• A new compiler directive show_performance_hints was added to disable the
  newly added performance hint output.
  (Github issue :issue:5748)

Bugs fixed

• ```cythonize required ``distutils`` even for operations that did not build binaries. (Github issue :issue:5751`)

• A regression in 3.0.3 was fixed that prevented calling inline functions
  from another inline function in .pxd files.
  (Github issue :issue:5748)

• Some C compiler warnings were resolved.
  Patch by Pierre Jolivet. (Github issue :issue:5756)

v3.0.3

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Features added

• More warnings were added to help users migrate and avoid bugs.
  (Github issue :issue:5650)

• A warning-like category for performance hints was added that bypasses -Werror.
  (Github issue :issue:5673)

• FastGIL now uses standard thread_local in C++.
  (Github issue :issue:5640)

• reference_wrapper was added to libcpp.functional.
  Patch by Vyas Ramasubramani. (Github issue :issue:5671)

• The cythonize command now supports the --cplus option known from the cython command.
  (Github issue :issue:5736)

Bugs fixed

• Performance regressions where the GIL was needlessly acquired were fixed.
  (Github issues :issue:5670, :issue:5700)

• A reference leak for exceptions in Python 3.12 was resolved.
  Patch by Eric Johnson. (Github issue :issue:5724)

• fastcall calls with keyword arguments generated incorrect C code.
  (Github issue :issue:5665)

• Assigning the type converted result of a conditional (if-else) expression
  to int or bool variables could lead to incorrect C code.
  (Github issue :issue:5731)

• Early (unlikely) failures in Python function wrappers no longer set a
  traceback in order to simplify the C code flow. Being mostly memory
  allocation errors, they probably would never have created a traceback anyway.
  (Github issue :issue:5681)

• Relative cimports from packages with __init__.py files could fail.
  (Github issue :issue:5715)

• Several issues with the Limited API support were resolved.
  (Github issues :issue:5641, :issue:5648, :issue:5689)

• The code generated for special-casing both Cython functions and PyCFunctions was cleaned up
  to avoid calling C-API functions that were not meant for the other type respectively.
  This could previously trigger assertions in CPython debug builds and now also plays better
  with the Limited API.
  (Github issues :issue:4804, :issue:5739)

• Fix some C compiler warnings.
  Patches by Ralf Gommers, Oleksandr Pavlyk, Sebastian Koslowski et al.
  (Github issues :issue:5651, :issue:5663, :issue:5668, :issue:5717, :issue:5726, :issue:5734)

• Generating gdb debugging information failed when using generator expressions.
  Patch by Oleksandr Pavlyk. (Github issue :issue:5552)

• Passing a setuptools.Extension into cythonize() instead of a
  distutils.Extension could make it miss the matching extensions.

• cython -M needlessly required distutils, which made it fail in Python 3.12.
  (Github issue :issue:5681)

Other changes

• The visible deprecation warning for DEF was removed again since it proved
  difficult for some users to migrate away from it. The statement is still
  meant to be removed at some point (and thus, like IF, should not be
  used in new code), but the time for sunset is probably not around the corner.
  (Github issue :issue:4310)

• The np_pythran option raise a DeprecationWarning if it receives other values
  than True and False. This will eventually be disallowed (in line with all
  other boolean options).

v3.0.2

Compare Source

==================

Bugs fixed

• Using None as default value for arguments annotated as int could crash Cython.
  (Github issue :issue:5643)

• Default values of fused types that include complex could generate invalid C code
  with -DCYTHON_CCOMPLEX=0.
  (Github issue :issue:5644)

• Using C++ enum class types in extension type method signatures could generate invalid C code.
  (Github issue :issue:5637)

v3.0.1

Compare Source

===================

Bugs fixed

• Release 3.0.11 introduced some incorrect noexcept warnings.
  (Github issue :issue:6335)

• Conditional assignments to variables using the walrus operator could crash.
  (Github issue :issue:6094)

• Dict assignments to struct members with reserved C names could generate invalid C code.

• Fused ctuples with the same entry types but different sizes could fail to compile.
  (Github issue :issue:6328)

• In Py3, pyximport was not searching sys.path when looking for importable source files.
  (Github issue :issue:5615)

• Using & 0 on integers produced with int.from_bytes() could read invalid memory on Python 3.10.
  (Github issue :issue:6480)

• Modules could fail to compile in PyPy 3.11 due to missing CPython specific header files.
  Patch by Matti Picus. (Github issue :issue:6482)

• Minor fix in C++ partial_sum() declaration.

v3.0.0

Compare Source

===========================

Cython 3.0.0 has been a very large effort that cleaned up many old warts,
introduced many new features, and introduces a couple of intentional
behaviour changes, even though the goal remained to stay compatible as
much as possible with Cython 0.29.x. For details, see the migration guide_.

.. _migration guide: https://cython.readthedocs.io/en/latest/src/userguide/migrating_to_cy30.html

As the development was spread out over several years, a lot of things have
happened in the meantime. Many crucial bugfixes and some features were
backported to 0.29.x and are not strictly speaking "new" in Cython 3.0.0.

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[misl6]

Keep it on <3 for now, we will likely remove it once all the recipes are built in an isolated environment.