chore(deps): update dependency cython to v3 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Cython (source)	<3.0 -> <3.1

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Release Notes

cython/cython (Cython)

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

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

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

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

Features added

• The error messages regarding exception declarations were improved in order to give
  better help about possible reasons and fixes.
  (Github issue :issue:5547)

Bugs fixed

• Memory view types in Python argument annotations no longer accept None. They now
  require an explicit Optional[] or a None default value in order to allow None
  to be passed. This was an oversight in the 3.0.0 release and is a BACKWARDS INCOMPATIBLE
  change. However, since it only applies to code using Python syntax, it probably only
  applies to newly written code that was written for Cython 3.0 and can easily be adapted.
  In most cases, we expect that this change will avoid bugs in user code rather than
  produce problems.
  (Github issue :issue:5612)

• nogil functions using parallel code could freeze when called with the GIL held.
  (Github issues :issue:5564, :issue:5573)

• Relative cimports could end up searching globally and find the same package installed
  elsewhere, potentially in another version.
  (Github issue :issue:5511)

• Attribute lookups on known standard library modules could accidentally search
  in the module namespace instead.
  (Github issue :issue:5536)

• Using constructed C++ default arguments could generate invalid C++ code.
  (Github issue :issue:5553)

• libcpp.memory.make_unique() was lacking C++ exception handling.
  (Github issue :issue:5560)

• Some non-public and deprecated CAPI usages were replaced by public
  (and thus more future proof) API code.

• Many issues with the Limited API support were resolved.
  Patches by Lisandro Dalcin et al.
  (Github issues :issue:5549, :issue:5550, :issue:5556, :issue:5605, :issue:5617)

• Some C compiler warnings were resolved.
  Patches by Matti Picus et al. (Github issues :issue:5557, :issue:5555)

• Large Python integers are now stored in hex instead of decimal strings to work around
  security limits in Python and generally speed up their Python object creation.

• NULL could not be used as default for fused type pointer arguments.
  (Github issue :issue:5554)

• C functions that return pointer types now return NULL as default exception value.
  Previously, calling code wasn't aware of this and always tested for raised exceptions.
  (Github issue :issue:5554)

• Untyped literal default arguments in fused functions could generate invalid C code.
  (Github issue :issue:5614)

• C variables declared as const could generate invalid C code when used in closures,
  generator expressions, ctuples, etc.
  (Github issues :issue:5558, :issue:5333)

• Enums could not refer to previously defined enums in their definition.
  (Github issue :issue:5602)

• The Python conversion code for anonymous C enums conflicted with regular int conversion.
  (Github issue :issue:5623)

• Using memory views for property methods (and other special methods) could lead to
  refcounting problems.
  (Github issue :issue:5571)

• Star-imports could generate code that tried to assign to constant C macros like
  PY_SSIZE_T_MAX and PY_SSIZE_T_MIN.
  Patch by Philipp Wagner. (Github issue :issue:5562)

• CYTHON_USE_TYPE_SPECS can now be (explicitly) enabled in PyPy.

• The template parameter "delimeters" in the Tempita Template class was corrected
  to "delimiters". The old spelling is still available in the main template API but
  now issues a DeprecationWarning.
  (Github issue :issue:5608)

• The cython --version output is now less likely to reach both stdout and stderr.
  Patch by Eli Schwartz. (Github issue :issue:5504)

• The sdist was missing the Shadow.pyi stub file.

v3.0.0

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

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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