Update multidict to 6.7.0

[pyup-bot]

This PR updates multidict from 4.1.0 to 6.7.0.

Changelog

6.7.0

=====

*(2025-10-05)*


Contributor-facing changes
--------------------------

- Updated tests and added CI for CPython 3.14 -- by :user:`kumaraditya303`.

*Related issues and pull requests on GitHub:*
:issue:`1235`.


----

6.6.4

=====

*(2025-08-11)*


Bug fixes
---------

- Fixed ``MutliDict`` & ``CIMultiDict`` memory leak when deleting values or clearing them 
-- by :user:`Vizonex`

*Related issues and pull requests on GitHub:*
:issue:`1233`.


Contributor-facing changes
--------------------------

- The type preciseness coverage report generated by `MyPy
<https://mypy-lang.org>`__ is now uploaded to `Coveralls
<https://coveralls.io/github/aio-libs/multidict>`__ and
will not be included in the `Codecov views
<https://app.codecov.io/gh/aio-libs/multidict>`__ going forward
-- by :user:`webknjaz`.

*Related issues and pull requests on GitHub:*
:issue:`1122`, :issue:`1231`.

- Added memory leak test for popping or deleting attributes from a multidict to prevent future issues or bogus claims.
-- by :user:`Vizonex`

*Related issues and pull requests on GitHub:*
:issue:`1233`.


----

6.6.3

=====

*(2025-06-30)*


Bug fixes
---------

- Fixed inconsistencies generated by the C implementation of ``_md_shrink()`` which might later lead to assertion failures and crash -- by :user:`Romain-Geissler-1A`.

*Related issues and pull requests on GitHub:*
:issue:`1229`.


----

6.6.2

=====

*(2025-06-28)*


Bug fixes
---------

- Fixed a memory corruption issue in the C implementation of ``_md_shrink()`` that could lead to segmentation faults and data loss when items were deleted from a :class:`~multidict.MultiDict`. The issue was an edge case in the pointer arithmetic during the compaction phase -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1221`, :issue:`1222`.

- Fixed format string compilation errors in debug builds on 32-bit platforms by using portable ``%zd`` format specifiers for ``Py_ssize_t`` values instead of ``%ld`` -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1225`, :issue:`1226`.


Packaging updates and notes for downstreams
-------------------------------------------

- Re-enabled 32-bit Linux wheel builds that were disabled by default in cibuildwheel 3.0.0 -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1225`, :issue:`1227`.


----

6.6.1

=====

*(2025-06-28)*


Bug fixes
---------

- If :meth:`multidict.MultiDict.extend`, :meth:`multidict.MultiDict.merge`, or :meth:`multidict.MultiDict.update` raises an exception, now the multidict internal state is correctly restored.
Patch by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1215`.


Contributor-facing changes
--------------------------

- Fixed ``setuptools`` deprecation warning about the license specification -- by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1216`.

- Fix compiler warnings and convert them to errors -- by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1217`.


----

6.6.0

=====

*(2025-06-27)*


Features
--------

- Added :meth:`multidict.MultiDict.merge` which copies all items from arguments if its key
not exist in the dictionary -- by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`292`.

- Stopped reallocating memory for the internal ``htkeys_t`` structure when inserting new items if the
multidict has deleted items and it could be collapsed in-place.  Removal of
``malloc()``/``free()`` improves the performance slightly.

The change affects C implementation only, pure Python code is not changed.

Patch by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1200`.

- C implementation of :class:`multidict.MultiDict.getall` now is slightly faster if it returns nothing -- by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1212`.


Improved documentation
----------------------

- Replaced docstring for :meth:`multidict.MultiDict.update` to don't use RST/markdown markup.

*Related issues and pull requests on GitHub:*
:issue:`1203`.

- Improved documentation for :meth:`multidict.MultiDict.extend` and :meth:`multidict.MultiDict.update` -- by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1205`.


Contributor-facing changes
--------------------------

- When building wheels, the source distribution is now passed directly
to the ``cibuildwheel`` invocation -- by :user:`webknjaz`.

*Related issues and pull requests on GitHub:*
:issue:`1199`.

- Set up ``PYTHONHASHSEED`` for benchmarks execution to make measured times stable -- by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1202`.


----

6.5.1

=====

*(2025-06-24)*


Bug fixes
---------

- Fixed a bug in C implementation when multidict is resized and it has deleted slots.

The bug was introduced by multidict 6.5.0 release.

Patch by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1195`.


Contributor-facing changes
--------------------------

- A pair of code formatters for Python and C have been configured in the pre-commit tool.

*Related issues and pull requests on GitHub:*
:issue:`1123`.

- Shorted fixture parametrization ids.

For example, ``test_keys_view_xor[case-insensitive-pure-python-module]`` becomes ``test_keys_view_xor[ci-py]`` -- by :user:`asvetlov`.

*Related issues and pull requests on GitHub:*
:issue:`1192`.

- The :file:`reusable-cibuildwheel.yml` workflow has been refactored to
be more generic and :file:`ci-cd.yml` now holds all the configuration
toggles -- by :user:`webknjaz`.

*Related issues and pull requests on GitHub:*
:issue:`1193`.


----

6.5.0

=====

*(2025-06-17)*

.. note::

The release was yanked because of :issue:`1195`, multidict 6.5.1 should be used
instead.


Features
--------

- Replace internal implementation from an array of items to hash table.
algorithmic complexity for lookups is switched from O(N) to O(1).

The hash table is very similar to :class:`dict` from CPython but it allows keys duplication.

The benchmark shows 25-50% boost for single lookups, x2-x3 for bulk updates, and x20 for
some multidict view operations.  The gain is not for free:
:class:`~multidict.MultiDict.add` and :class:`~multidict.MultiDict.extend` are 25-50%
slower now. We consider it as acceptable because the lookup is much more common
operation that addition for the library domain.

*Related issues and pull requests on GitHub:*
:issue:`1128`.


Contributor-facing changes
--------------------------

- Builds have been added for arm64 Windows
wheels and the ``reusable-build-wheel.yml``
template has been modified to allow for
an os value (``windows-11-arm``) which
does not end with the ``-latest`` postfix.

*Related issues and pull requests on GitHub:*
:issue:`1167`.


----

6.4.4

=====

*(2025-05-19)*


Bug fixes
---------

- Fixed a segmentation fault when calling :py:meth:`multidict.MultiDict.setdefault` with a single argument -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1160`.

- Fixed a segmentation fault when attempting to directly instantiate view objects
(``multidict._ItemsView``, ``multidict._KeysView``, ``multidict._ValuesView``) -- by :user:`bdraco`.

View objects now raise a proper :exc:`TypeError` with the message "cannot create '...' instances directly"
when direct instantiation is attempted.

View objects should only be created through the proper methods: :py:meth:`multidict.MultiDict.items`,
:py:meth:`multidict.MultiDict.keys`, and :py:meth:`multidict.MultiDict.values`.

*Related issues and pull requests on GitHub:*
:issue:`1164`.


Miscellaneous internal changes
------------------------------

- :class:`multidict.MultiDictProxy` was refactored to rely only on
:class:`multidict.MultiDict` public interface and don't touch any implementation
details.

*Related issues and pull requests on GitHub:*
:issue:`1150`.

- Multidict views were refactored to rely only on
:class:`multidict.MultiDict` API and don't touch any implementation
details.

*Related issues and pull requests on GitHub:*
:issue:`1152`.

- Dropped internal ``_Impl`` class from pure Python implementation, both pure Python and C
Extension follows the same design internally now.

*Related issues and pull requests on GitHub:*
:issue:`1153`.


----

6.4.3

=====

*(2025-04-10)*


Bug fixes
---------

- Fixed building the library in debug mode.

*Related issues and pull requests on GitHub:*
:issue:`1144`.

- Fixed custom ``PyType_GetModuleByDef()`` when non-heap type object was passed.

*Related issues and pull requests on GitHub:*
:issue:`1147`.


Packaging updates and notes for downstreams
-------------------------------------------

- Added the ability to build in debug mode by setting :envvar:`MULTIDICT_DEBUG_BUILD` in the environment -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1145`.


----

6.4.2

=====

*(2025-04-09)*


Bug fixes
---------

- Fixed a segmentation fault when creating subclassed :py:class:`~multidict.MultiDict` objects on Python < 3.11 -- by :user:`bdraco`.

The problem first appeared in 6.4.0

*Related issues and pull requests on GitHub:*
:issue:`1141`.


----

6.4.1

=====

*(2025-04-09)*


No significant changes.


----

6.4.0

=====

*(2025-04-09)*


Bug fixes
---------

- Fixed a memory leak creating new :class:`~multidict.istr` objects -- by :user:`bdraco`.

The leak was introduced in 6.3.0

*Related issues and pull requests on GitHub:*
:issue:`1133`.

- Fixed reference counting when calling :py:meth:`multidict.MultiDict.update` -- by :user:`bdraco`.

The leak was introduced in 4.4.0

*Related issues and pull requests on GitHub:*
:issue:`1135`.


Features
--------

- Switched C Extension to use heap types and the module state.

*Related issues and pull requests on GitHub:*
:issue:`1125`.

- Started building armv7l wheels -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1127`.


----

6.3.2

=====

*(2025-04-03)*


Bug fixes
---------

- Resolved a memory leak by ensuring proper reference count decrementation -- by :user:`asvetlov` and :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1121`.


----

6.3.1

=====

*(2025-04-01)*


Bug fixes
---------

- Fixed keys not becoming case-insensitive when :class:`multidict.CIMultiDict` is created by passing in a :class:`multidict.MultiDict` -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1112`.

- Fixed the pure Python version mutating the original :class:`multidict.MultiDict` when creating a new :class:`multidict.CIMultiDict` from an existing one when keyword arguments are also passed -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1113`.

- Prevented crashing with a segfault when :func:`repr` is called for recursive multidicts and their proxies and views.

*Related issues and pull requests on GitHub:*
:issue:`1115`.


----

6.3.0

=====

*(2025-03-31)*


Bug fixes
---------

- Set operations for ``KeysView`` and ``ItemsView`` of case-insensitive multidicts and their proxies are processed in case-insensitive manner.

*Related issues and pull requests on GitHub:*
:issue:`965`.

- Rewrote :class:`multidict.CIMultiDict` and it proxy to always return
:class:`multidict.istr` keys. ``istr`` is derived from :class:`str`,
thus the change is backward compatible.

The performance boost is about 15% for some operations for C Extension,
pure Python implementation have got a visible (15% - 230%) speedup as well.

*Related issues and pull requests on GitHub:*
:issue:`1097`.

- Fixed a crash when extending a multidict from multidict proxy if C Extensions were used.

*Related issues and pull requests on GitHub:*
:issue:`1100`.


Features
--------

- Implemented a custom parser for ``METH_FASTCALL | METH_KEYWORDS`` protocol
-- by :user:`asvetlov`.

The patch re-enables fast call protocol in the :py:mod:`multidict` C Extension.

Speedup is about 25%-30% for the library benchmarks for Python 3.12+.

*Related issues and pull requests on GitHub:*
:issue:`1070`.

- The C-extension no longer pre-allocates a Python exception object in
lookup-related methods of :py:class:`~multidict.MultiDict` when the
passed-in *key* is not found but *default* value is provided.

Namely, this affects :py:meth:`MultiDict.getone()
<multidict.MultiDict.getone>`, :py:meth:`MultiDict.getall()
<multidict.MultiDict.getall>`, :py:meth:`MultiDict.get()
<multidict.MultiDict.get>`, :py:meth:`MultiDict.pop()
<multidict.MultiDict.pop>`, :py:meth:`MultiDict.popone()
<multidict.MultiDict.popone>`, and :py:meth:`MultiDict.popall()
<multidict.MultiDict.popall>`.

Additionally, the :py:class:`~multidict.MultiDict` comparison with
regular :py:class:`dict`\ ionaries is now about 60% faster
on Python 3.13+ in the fallback-to-default case.

*Related issues and pull requests on GitHub:*
:issue:`1078`.

- Implemented ``__repr__()`` for C Extension classes in C.

The speedup is about 2.5 times.

*Related issues and pull requests on GitHub:*
:issue:`1081`.

- Made C version of :class:`multidict.istr` pickleable.

*Related issues and pull requests on GitHub:*
:issue:`1098`.

- Optimized multidict creation and extending / updating if C Extensions are used.

The speedup is between 25% and 70% depending on the usage scenario.

*Related issues and pull requests on GitHub:*
:issue:`1101`.

- :meth:`multidict.MultiDict.popitem` is changed to remove
the latest entry instead of the first.

It gives O(1) amortized complexity.

The standard :meth:`dict.popitem` removes the last entry also.

*Related issues and pull requests on GitHub:*
:issue:`1105`.


Contributor-facing changes
--------------------------

- Started running benchmarks for the pure Python implementation in addition to the C implementation -- by :user:`bdraco`.

*Related issues and pull requests on GitHub:*
:issue:`1092`.

- The the project-wide Codecov_ metric is no longer reported
via GitHub Checks API. The combined value is not very useful
because one of the sources (MyPy) cannot reach 100% with the
current state of the ecosystem. We may want to reconsider in
the future. Instead, we now have two separate
“runtime coverage” metrics for library code and tests.
They are to be kept at 100% at all times.
And the “type coverage” metric will remain advisory, at a
lower threshold.

The default patch metric check is renamed to “runtime”
to better reflect its semantics. This one will also require
100% coverage.
Another “typing” patch coverage metric is now reported
alongside it. It's considered advisory, just like its
project counterpart.

When looking at Codecov_, one will likely want to look at
MyPy and pytest flags separately. It is usually best to
avoid looking at the PR pages that sometimes display
combined coverage incorrectly.

The change additionally disables the deprecated GitHub
Annotations integration in Codecov_.

Finally, the badge coloring range now starts at 100%.


.. image:: https://codecov.io/gh/aio-libs/multidict/branch/master/graph/badge.svg?flag=pytest
  :target: https://codecov.io/gh/aio-libs/multidict?flags[]=pytest
  :alt: Coverage metrics


-- by :user:`webknjaz`

*Related issues and pull requests on GitHub:*
:issue:`1093`.


Miscellaneous internal changes
------------------------------

- Synchronized :file:`pythoncapi_compat.h` with the latest available version.

*Related issues and pull requests on GitHub:*
:issue:`1063`.

- Moved registering ABCs for C Extension classes from C to Python.

*Related issues and pull requests on GitHub:*
:issue:`1083`.

- Refactored the internal ``pair_list`` implementation.

*Related issues and pull requests on GitHub:*
:issue:`1084`.

- Implemented views comparison and disjoints in C instead of Python helpers.

The performance boost is about 40%.

*Related issues and pull requests on GitHub:*
:issue:`1096`.


----

6.2.0

======

*(2025-03-17)*


Bug fixes
---------

- Fixed ``in`` checks throwing an exception instead of returning :data:`False` when testing non-strings.

*Related issues and pull requests on GitHub:*
:issue:`1045`.

- Fixed a leak when the last accessed module in ``PyInit__multidict()`` init is not released.

*Related issues and pull requests on GitHub:*
:issue:`1061`.


Features
--------

- Implemented support for the free-threaded build of CPython 3.13 -- by :user:`lysnikolaou`.

*Related issues and pull requests on GitHub:*
:issue:`1015`.


Packaging updates and notes for downstreams
-------------------------------------------

- Started publishing wheels made for the free-threaded build of CPython 3.13 -- by :user:`lysnikolaou`.

*Related issues and pull requests on GitHub:*
:issue:`1015`.


Miscellaneous internal changes
------------------------------

- Used stricter typing across the code base, resulting in improved typing accuracy across multidict classes.
Funded by an ``NLnet`` grant.

*Related issues and pull requests on GitHub:*
:issue:`1046`.


----

6.1.0

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

Bug fixes
---------

- Covered the unreachable code path in
``multidict._multidict_base._abc_itemsview_register()``
with typing -- by :user:`skinnyBat`.


*Related issues and pull requests on GitHub:*
:issue:`928`.




Features
--------

- Added support for Python 3.13 -- by :user:`bdraco`.


*Related issues and pull requests on GitHub:*
:issue:`1002`.




Removals and backward incompatible breaking changes
---------------------------------------------------

- Removed Python 3.7 support -- by :user:`bdraco`.


*Related issues and pull requests on GitHub:*
:issue:`997`.




Contributor-facing changes
--------------------------

- Added tests to have full code coverage of the
``multidict._multidict_base._viewbaseset_richcmp()`` function
-- by :user:`skinnyBat`.


*Related issues and pull requests on GitHub:*
:issue:`928`.



- `The deprecated <https://hynek.me/til/set-output-deprecation-github-actions/>`_
``::set-output`` workflow command has been replaced
by the ``$GITHUB_OUTPUT`` environment variable
in the GitHub Actions CI/CD workflow definition.


*Related issues and pull requests on GitHub:*
:issue:`940`.



- `codecov-action <https://github.com/codecov/codecov-action>`_
has been temporarily downgraded to ``v3``
in the GitHub Actions CI/CD workflow definitions
in order to fix uploading coverage to Codecov_.
See `this issue <https://github.com/codecov/codecov-action/issues/1252>`_
for more details.


.. _Codecov: https://codecov.io/gh/aio-libs/multidict?flags[]=pytest


*Related issues and pull requests on GitHub:*
:issue:`941`.



- In the GitHub Actions CI/CD workflow definition,
the ``Get pip cache dir`` step has been fixed for
Windows runners by adding ``shell: bash``.
See `actions/runner2224 <https://github.com/actions/runner/issues/2224>`_
for more details.


*Related issues and pull requests on GitHub:*
:issue:`942`.



- Interpolation of the ``pip`` cache keys has been
fixed by adding missing ``$`` syntax
in the GitHub Actions CI/CD workflow definition.


*Related issues and pull requests on GitHub:*
:issue:`943`.




----

6.0.5

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

Bug fixes
---------

- Upgraded the C-API macros that have been deprecated in Python 3.9
and later removed in 3.13 -- by :user:`iemelyanov`.


*Related issues and pull requests on GitHub:*
:issue:`862`, :issue:`864`, :issue:`868`, :issue:`898`.



- Reverted to using the public argument parsing API
:c:func:`PyArg_ParseTupleAndKeywords` under Python 3.12
-- by :user:`charles-dyfis-net` and :user:`webknjaz`.

The effect is that this change prevents build failures with
clang 16.9.6 and gcc-14 reported in :issue:`926`. It also
fixes a segmentation fault crash caused by passing keyword
arguments to :py:meth:`MultiDict.getall()
<multidict.MultiDict.getall>` discovered by :user:`jonaslb`
and :user:`hroncok` while examining the problem.


*Related issues and pull requests on GitHub:*
:issue:`862`, :issue:`909`, :issue:`926`, :issue:`929`.



- Fixed a ``SystemError: null argument to internal routine`` error on
a ``MultiDict.items().isdisjoint()`` call when using C Extensions.


*Related issues and pull requests on GitHub:*
:issue:`927`.




Improved documentation
----------------------

- On the `Contributing docs <https://github.com/aio-libs/multidict/blob/master/CHANGES/README.rst>`_ page,
a link to the ``Towncrier philosophy`` has been fixed.


*Related issues and pull requests on GitHub:*
:issue:`911`.




Packaging updates and notes for downstreams
-------------------------------------------

- Stopped marking all files as installable package data
-- by :user:`webknjaz`.

This change helps ``setuptools`` understand that C-headers are
not to be installed under :file:`lib/python3.{x}/site-packages/`.



*Related commits on GitHub:*
:commit:`31e1170`.


- Started publishing pure-python wheels to be installed
as a fallback -- by :user:`webknjaz`.



*Related commits on GitHub:*
:commit:`7ba0e72`.


- Switched from ``setuptools``' legacy backend (``setuptools.build_meta:__legacy__``)
to the modern one (``setuptools.build_meta``) by actually specifying the
the ``[build-system] build-backend`` option in :file:`pyproject.toml`
-- by :user:`Jackenmen`.


*Related issues and pull requests on GitHub:*
:issue:`802`.



- Declared Python 3.12 supported officially in the
distribution package metadata -- by :user:`hugovk`.


*Related issues and pull requests on GitHub:*
:issue:`877`.




Contributor-facing changes
--------------------------

- The test framework has been refactored. In the previous state, the circular
imports reported in :issue:`837` caused the C-extension tests to be skipped.

Now, there is a set of the ``pytest`` fixtures that is set up in a parametrized
manner allowing to have a consistent way of accessing mirrored ``multidict``
implementations across all the tests.

This change also implemented a pair of CLI flags (``--c-extensions`` /
``--no-c-extensions``) that allow to explicitly request deselecting the tests
running against the C-extension.

-- by :user:`webknjaz`.


*Related issues and pull requests on GitHub:*
:issue:`98`, :issue:`837`, :issue:`915`.



- Updated the test pins lockfile used in the
``cibuildwheel`` test stage -- by :user:`hoodmane`.


*Related issues and pull requests on GitHub:*
:issue:`827`.



- Added an explicit ``void`` for arguments in C-function signatures
which addresses the following compiler warning:

.. code-block:: console

  warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]

-- by :user:`hoodmane`


*Related issues and pull requests on GitHub:*
:issue:`828`.



- An experimental Python 3.13 job now runs in the CI
-- :user:`webknjaz`.


*Related issues and pull requests on GitHub:*
:issue:`920`.



- Added test coverage for the :ref:`and <python:and>`, :ref:`or
<python:or>`, :py:obj:`sub <python:object.__sub__>`, and
:py:obj:`xor <python:object.__xor__>` operators in the
:file:`multidict/_multidict_base.py` module. It also covers
:py:data:`NotImplemented` and
":py:class:`~typing.Iterable`-but-not-:py:class:`~typing.Set`"
cases there.

-- by :user:`a5r0n`


*Related issues and pull requests on GitHub:*
:issue:`936`.



- The version of pytest is now capped below 8, when running MyPy
against Python 3.7. This pytest release dropped support for
said runtime.


*Related issues and pull requests on GitHub:*
:issue:`937`.




----

6.0.4

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

Bugfixes
--------

- Fixed a type annotations regression introduced in v6.0.2 under Python versions <3.10. It was caused by importing certain types only available in newer versions. (:issue:`798`)

6.0.3

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

Features
--------

- Declared the official support for Python 3.11 — by :user:`mlegner`. (:issue:`872`)

6.0.2

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

Bugfixes
--------

- Revert :issue:`644`, restore type annotations to as-of 5.2.0 version. (:issue:`688`)

6.0.1

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

Bugfixes
--------

- Restored back ``MultiDict``, ``CIMultiDict``, ``MultiDictProxy``, and
``CIMutiDictProxy`` generic type arguments; they are parameterized by value type, but the
key type is fixed by container class.

``MultiDict[int]`` means ``MutableMultiMapping[str, int]``. The key type of
``MultiDict`` is always ``str``, while all str-like keys are accepted by API and
converted to ``str`` internally.

The same is true for ``CIMultiDict[int]`` which means ``MutableMultiMapping[istr,
int]``. str-like keys are accepted but converted to ``istr`` internally. (:issue:`682`)

6.0.0

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

Features
--------

- Use ``METH_FASTCALL`` where it makes sense.

``MultiDict.add()`` is 2.2 times faster now, ``CIMultiDict.add()`` is 1.5 times faster.
The same boost is applied to ``get*()``, ``setdefault()``, and ``pop*()`` methods. (:issue:`681`)


Bugfixes
--------

- Fixed type annotations for keys of multidict mapping classes. (:issue:`644`)
- Support Multidict[int] for pure-python version.
``__class_getitem__`` is already provided by C Extension, making it work with the pure-extension too. (:issue:`678`)


Deprecations and Removals
-------------------------

- Dropped Python 3.6 support (:issue:`680`)


Misc
----

- :issue:`659`

5.2.0

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

Features
--------

- 1. Added support Python 3.10
2. Started shipping platform-specific wheels with the ``musl`` tag targeting typical Alpine Linux runtimes.
3. Started shipping platform-specific arm64 wheels for Apple Silicon. (:issue:`629`)


Bugfixes
--------

- Fixed pure-python implementation that used to raise "Dictionary changed during iteration" error when iterated view (``.keys()``, ``.values()`` or ``.items()``) was created before the dictionary's content change. (:issue:`620`)

5.1.0

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

Features
--------

- Supported ``GenericAliases`` (``MultiDict[str]``) for Python 3.9+
:issue:`553`


Bugfixes
--------

- Synchronized the declared supported Python versions in ``setup.py`` with actually supported and tested ones.
:issue:`552`


----

5.0.1

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

Bugfixes
--------

- Provided x86 Windows wheels
:issue:`550`


----

5.0.0

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

Features
--------

- Provided wheels for ``aarch64``, ``i686``, ``ppc64le``, ``s390x`` architectures on Linux
as well as ``x86_64``.
:issue:`500`
- Provided wheels for Python 3.9.
:issue:`534`

Removal
-------

- Dropped Python 3.5 support; Python 3.6 is the minimal supported Python version.

Misc
----

- :issue:`503`


----

4.7.6

------------------

Bugfixes
^^^^^^^^

- Fixed an issue with some versions of the ``wheel`` dist
failing because of being unable to detect the license file.
:issue:`481`

4.7.5

------------------

Bugfixes
^^^^^^^^

- Fixed creating and updating of :class:`~multidict.MultiDict`
from a sequence of pairs and keyword arguments. Previously passing
a list argument modified it inplace, and other sequences caused an
error.
:issue:`457`
- Fixed comparing with mapping: an exception raised in the
:py:meth:`~object.__len__` method caused raising a SyntaxError.
:issue:`459`
- Fixed comparing with mapping: all exceptions raised in the
:py:meth:`~object.__getitem__` method were silenced.
:issue:`460`

4.7.4

------------------

Bugfixes
^^^^^^^^

- ``MultiDict.iter`` fix memory leak when used iterator over
:py:class:`~multidict.MultiDict` instance.
:issue:`452`

4.7.3

----------------------------

Features
^^^^^^^^

- Implement ``__sizeof__`` function to correctly calculate all internal structures size.
:issue:`444`
- Expose ``getversion()`` function.
:issue:`451`


Bugfixes
^^^^^^^^

- Fix crashes in ``popone``/``popall`` when default is returned.
:issue:`450`


Improved Documentation
^^^^^^^^^^^^^^^^^^^^^^

- Corrected the documentation for ``MultiDict.extend()``
:issue:`446`

4.7.2

------------------

Bugfixes
^^^^^^^^

- Fixed crashing when multidict is used pyinstaller
:issue:`432`
- Fixed typing for :py:meth:`CIMultiDict.copy() <multidict.MultiDict.copy>`
:issue:`434`
- Fixed a memory leak in :py:meth:`MultiDict.copy() <multidict.MultiDict.copy>`
:issue:`443`

4.7.1

------------------

Bugfixes
^^^^^^^^

- :py:meth:`CIMultiDictProxy.copy() <multidict.MultiDictProxy.copy>` fixed to
return a case-insensitive :py:class:`multidict._multidict.CIMultiDict()
<multidict.MultiDict>` object.
:issue:`427`
- Made :py:class:`~multidict.CIMultiDict` subclassable again.
:issue:`416`
- Fixed a regression, :class:`multidict.MultiDict` can be constructed
from an arbitrary iterable of pairs again.
:issue:`418`
- :py:meth:`CIMultiDict.add() <multidict.MultiDict.add>` may be called
with keyword arguments now.
:issue:`421`


Improved Documentation
^^^^^^^^^^^^^^^^^^^^^^

- Mention ``MULTIDICT_NO_EXTENSIONS`` environment variable in docs.
:issue:`393`
- Document the fact that ``istr`` preserves the casing of argument untouched but uses internal lower-cased copy for keys comparison.
:issue:`419`

4.7.0

------------------

Features
^^^^^^^^

- Replace Cython optimization with pure C
:issue:`249`
- Implement ``__length_hint__()`` for iterators
:issue:`310`
- Support the MultiDict[str] generic specialization in the runtime.
:issue:`392`
- Embed pair_list_t structure into MultiDict Python object
:issue:`395`
- Embed multidict pairs for small dictionaries to amortize the memory usage.
:issue:`396`
- Support weak references to C Extension classes.
:issue:`399`
- Add docstrings to provided classes.
:issue:`400`
- Merge ``multidict._istr`` back with ``multidict._multidict``.
:issue:`409`


Bugfixes
^^^^^^^^

- Explicitly call ``tp_free`` slot on deallocation.
:issue:`407`
- Return class from __class_getitem__ to simplify subclassing
:issue:`413`

4.6.1

------------------

Bugfixes
^^^^^^^^

- Fix PyPI link for GitHub Issues badge.
:issue:`391`

4.6.0

------------------

Bugfixes
^^^^^^^^

- Fix GC object tracking.
:issue:`314`
- Preserve the case of `istr` strings.
:issue:`374`
- Generate binary wheels for Python 3.8.

4.5.2

------------------

* Fix another memory leak introduced by 4.5.0 release
:issue:`307`

4.5.1

------------------

* Fix a memory leak introduced by 4.5.0 release
:issue:`306`

4.5.0

------------------

* Multidict views ported from Cython to C extension
:issue:`275`

4.4.2

------------------

* Restore Python 3.4 support
:issue:`289`

4.4.1

------------------

* Fix type annotations
:issue:`283`)

* Allow to install the library on systems without compilation toolset
:issue:`281`

4.4.0

------------------

* Rewrite C implementation to use C pair list.

* Fix update order when both ``arg`` and ``kwargs`` are used.

4.3.1

------------------

* Fix a typo in multidict stub file.

4.3.0

------------------

* Polish type hints, make multidict type definitions generic.

4.2.0

------------------

* Publish ``py.typed`` flag for type hinting analyzers (``mypy`` etc).

Links

• PyPI: https://pypi.org/project/multidict
• Changelog: https://data.safetycli.com/changelogs/multidict/
• Repo: https://github.com/aio-libs/multidict