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Update attrs to 21.2.0 #940

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This PR updates attrs from 17.4.0 to 21.2.0.

Changelog

21.2.0

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

Backward-incompatible Changes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- We had to revert the recursive feature for ``attr.evolve()`` because it broke some use-cases -- sorry!
`806 <https://github.com/python-attrs/attrs/issues/806>`_
- Python 3.4 is now blocked using packaging metadata because ``attrs`` can't be imported on it anymore.
To ensure that 3.4 users can keep installing  ``attrs`` easily, we will `yank <https://pypi.org/help/#yanked>`_ 21.1.0 from PyPI.
This has **no** consequences if you pin ``attrs`` to 21.1.0.
`807 <https://github.com/python-attrs/attrs/issues/807>`_


----

21.1.0

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

Deprecations
^^^^^^^^^^^^

- The long-awaited, much-talked-about, little-delivered ``import attrs`` is finally upon us!

Since the NG APIs have now been proclaimed stable, the **next** release of ``attrs`` will allow you to actually ``import attrs``.
We're taking this opportunity to replace some defaults in our APIs that made sense in 2015, but don't in 2021.

So please, if you have any pet peeves about defaults in ``attrs``'s APIs, *now* is the time to air your grievances in 487!
We're not gonna get such a chance for a second time, without breaking our backward-compatibility guarantees, or long deprecation cycles.
Therefore, speak now or forever hold you peace!
`487 <https://github.com/python-attrs/attrs/issues/487>`_
- The *cmp* argument to ``attr.s()`` and `attr.ib()` has been **undeprecated**
It will continue to be supported as syntactic sugar to set *eq* and *order* in one go.

I'm terribly sorry for the hassle around this argument!
The reason we're bringing it back is it's usefulness regarding customization of equality/ordering.

The ``cmp`` attribute and argument on ``attr.Attribute`` remains deprecated and will be removed later this year.
`773 <https://github.com/python-attrs/attrs/issues/773>`_


Changes
^^^^^^^

- It's now possible to customize the behavior of ``eq`` and ``order`` by passing in a callable.
`435 <https://github.com/python-attrs/attrs/issues/435>`_,
`627 <https://github.com/python-attrs/attrs/issues/627>`_
- The instant favorite `next-generation APIs <https://www.attrs.org/en/stable/api.html#next-gen>`_ are not provisional anymore!

They are also officially supported by Mypy as of their `0.800 release <https://mypy-lang.blogspot.com/2021/01/mypy-0800-released.html>`_.

We hope the next release will already contain an (additional) importable package called ``attrs``.
`668 <https://github.com/python-attrs/attrs/issues/668>`_,
`786 <https://github.com/python-attrs/attrs/issues/786>`_
- If an attribute defines a converter, the type of its parameter is used as type annotation for its corresponding ``__init__`` parameter.

If an ``attr.converters.pipe`` is used, the first one's is used.
`710 <https://github.com/python-attrs/attrs/issues/710>`_
- Fixed the creation of an extra slot for an ``attr.ib`` when the parent class already has a slot with the same name.
`718 <https://github.com/python-attrs/attrs/issues/718>`_
- ``__attrs__init__()`` will now be injected if ``init=False``, or if ``auto_detect=True`` and a user-defined ``__init__()`` exists.

This enables users to do "pre-init" work in their ``__init__()`` (such as ``super().__init__()``).

``__init__()`` can then delegate constructor argument processing to ``self.__attrs_init__(*args, **kwargs)``.
`731 <https://github.com/python-attrs/attrs/issues/731>`_
- ``bool(attr.NOTHING)`` is now ``False``.
`732 <https://github.com/python-attrs/attrs/issues/732>`_
- It's now possible to use ``super()`` inside of properties of slotted classes.
`747 <https://github.com/python-attrs/attrs/issues/747>`_
- Allow for a ``__attrs_pre_init__()`` method that -- if defined -- will get called at the beginning of the ``attrs``-generated ``__init__()`` method.
`750 <https://github.com/python-attrs/attrs/issues/750>`_
- Added forgotten ``attr.Attribute.evolve()`` to type stubs.
`752 <https://github.com/python-attrs/attrs/issues/752>`_
- ``attrs.evolve()`` now works recursively with nested ``attrs`` classes.
`759 <https://github.com/python-attrs/attrs/issues/759>`_
- Python 3.10 is now officially supported.
`763 <https://github.com/python-attrs/attrs/issues/763>`_
- ``attr.resolve_types()`` now takes an optional *attrib* argument to work inside a ``field_transformer``.
`774 <https://github.com/python-attrs/attrs/issues/774>`_
- ``ClassVar``\ s are now also detected if they come from `typing-extensions <https://pypi.org/project/typing-extensions/>`_.
`782 <https://github.com/python-attrs/attrs/issues/782>`_
- To make it easier to customize attribute comparison (435), we have added the ``attr.cmp_with()`` helper.

See the `new docs on comparison <https://www.attrs.org/en/stable/comparison.html>`_ for more details.
`787 <https://github.com/python-attrs/attrs/issues/787>`_
- Added **provisional** support for static typing in ``pyright`` via the `dataclass_transforms specification <https://github.com/microsoft/pyright/blob/master/specs/dataclass_transforms.md>`_.
Both the ``pyright`` specification and ``attrs`` implementation may change in future versions of both projects.

Your constructive feedback is welcome in both `attrs795 <https://github.com/python-attrs/attrs/issues/795>`_ and `pyright#1782 <https://github.com/microsoft/pyright/discussions/1782>`_.
`796 <https://github.com/python-attrs/attrs/issues/796>`_


----

20.3.0

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

Backward-incompatible Changes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- ``attr.define()``, ``attr.frozen()``, ``attr.mutable()``, and ``attr.field()`` remain **provisional**.

This release does **not** change change anything about them and they are already used widely in production though.

If you wish to use them together with mypy, you can simply drop `this plugin <https://gist.github.com/hynek/1e3844d0c99e479e716169034b5fa963#file-attrs_ng_plugin-py>`_ into your project.

Feel free to provide feedback to them in the linked issue 668.

We will release the ``attrs`` namespace once we have the feeling that the APIs have properly settled.
`668 <https://github.com/python-attrs/attrs/issues/668>`_


Changes
^^^^^^^

- ``attr.s()`` now has a *field_transformer* hook that is called for all ``Attribute``\ s and returns a (modified or updated) list of ``Attribute`` instances.
``attr.asdict()`` has a *value_serializer* hook that can change the way values are converted.
Both hooks are meant to help with data (de-)serialization workflows.
`653 <https://github.com/python-attrs/attrs/issues/653>`_
- ``kw_only=True`` now works on Python 2.
`700 <https://github.com/python-attrs/attrs/issues/700>`_
- ``raise from`` now works on frozen classes on PyPy.
`703 <https://github.com/python-attrs/attrs/issues/703>`_,
`712 <https://github.com/python-attrs/attrs/issues/712>`_
- ``attr.asdict()`` and ``attr.astuple()`` now treat ``frozenset``\ s like ``set``\ s with regards to the *retain_collection_types* argument.
`704 <https://github.com/python-attrs/attrs/issues/704>`_
- The type stubs for ``attr.s()`` and ``attr.make_class()`` are not missing the *collect_by_mro* argument anymore.
`711 <https://github.com/python-attrs/attrs/issues/711>`_


----

20.2.0

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

Backward-incompatible Changes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- ``attr.define()``, ``attr.frozen()``, ``attr.mutable()``, and ``attr.field()`` remain **provisional**.

This release fixes a bunch of bugs and ergonomics but they remain mostly unchanged.

If you wish to use them together with mypy, you can simply drop `this plugin <https://gist.github.com/hynek/1e3844d0c99e479e716169034b5fa963#file-attrs_ng_plugin-py>`_ into your project.

Feel free to provide feedback to them in the linked issue 668.

We will release the ``attrs`` namespace once we have the feeling that the APIs have properly settled.
`668 <https://github.com/python-attrs/attrs/issues/668>`_


Changes
^^^^^^^

- ``attr.define()`` et al now correct detect ``__eq__`` and ``__ne__``.
`671 <https://github.com/python-attrs/attrs/issues/671>`_
- ``attr.define()`` et al's hybrid behavior now also works correctly when arguments are passed.
`675 <https://github.com/python-attrs/attrs/issues/675>`_
- It's possible to define custom ``__setattr__`` methods on slotted classes again.
`681 <https://github.com/python-attrs/attrs/issues/681>`_
- In 20.1.0 we introduced the ``inherited`` attribute on the ``attr.Attribute`` class to differentiate attributes that have been inherited and those that have been defined directly on the class.

It has shown to be problematic to involve that attribute when comparing instances of ``attr.Attribute`` though, because when sub-classing, attributes from base classes are suddenly not equal to themselves in a super class.

Therefore the ``inherited`` attribute will now be ignored when hashing and comparing instances of ``attr.Attribute``.
`684 <https://github.com/python-attrs/attrs/issues/684>`_
- ``zope.interface`` is now a "soft dependency" when running the test suite; if ``zope.interface`` is not installed when running the test suite, the interface-related tests will be automatically skipped.
`685 <https://github.com/python-attrs/attrs/issues/685>`_
- The ergonomics of creating frozen classes using ``define(frozen=True)`` and sub-classing frozen classes has been improved:
you don't have to set ``on_setattr=None`` anymore.
`687 <https://github.com/python-attrs/attrs/issues/687>`_


----

20.1.0

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

Backward-incompatible Changes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Python 3.4 is not supported anymore.
It has been unsupported by the Python core team for a while now, its PyPI downloads are negligible, and our CI provider removed it as a supported option.

It's very unlikely that ``attrs`` will break under 3.4 anytime soon, which is why we do *not* block its installation on Python 3.4.
But we don't test it anymore and will block it once someone reports breakage.
`608 <https://github.com/python-attrs/attrs/issues/608>`_


Deprecations
^^^^^^^^^^^^

- Less of a deprecation and more of a heads up: the next release of ``attrs`` will introduce an ``attrs`` namespace.
That means that you'll finally be able to run ``import attrs`` with new functions that aren't cute abbreviations and that will carry better defaults.

This should not break any of your code, because project-local packages have priority before installed ones.
If this is a problem for you for some reason, please report it to our bug tracker and we'll figure something out.

The old ``attr`` namespace isn't going anywhere and its defaults are not changing – this is a purely additive measure.
Please check out the linked issue for more details.

These new APIs have been added *provisionally* as part of 666 so you can try them out today and provide feedback.
Learn more in the `API docs <https://www.attrs.org/en/stable/api.html#provisional-apis>`_.
`408 <https://github.com/python-attrs/attrs/issues/408>`_


Changes
^^^^^^^

- Added ``attr.resolve_types()``.
It ensures that all forward-references and types in string form are resolved into concrete types.

You need this only if you need concrete types at runtime.
That means that if you only use types for static type checking, you do **not** need this function.
`288 <https://github.com/python-attrs/attrs/issues/288>`_,
`302 <https://github.com/python-attrs/attrs/issues/302>`_
- Added ``attr.s(collect_by_mro=False)`` argument that if set to ``True`` fixes the collection of attributes from base classes.

It's only necessary for certain cases of multiple-inheritance but is kept off for now for backward-compatibility reasons.
It will be turned on by default in the future.

As a side-effect, ``attr.Attribute`` now *always* has an ``inherited`` attribute indicating whether an attribute on a class was directly defined or inherited.
`428 <https://github.com/python-attrs/attrs/issues/428>`_,
`635 <https://github.com/python-attrs/attrs/issues/635>`_
- On Python 3, all generated methods now have a docstring explaining that they have been created by ``attrs``.
`506 <https://github.com/python-attrs/attrs/issues/506>`_
- It is now possible to prevent ``attrs`` from auto-generating the ``__setstate__`` and ``__getstate__`` methods that are required for pickling of slotted classes.

Either pass ``attr.s(getstate_setstate=False)`` or pass ``attr.s(auto_detect=True)`` and implement them yourself:
if ``attrs`` finds either of the two methods directly on the decorated class, it assumes implicitly ``getstate_setstate=False`` (and implements neither).

This option works with dict classes but should never be necessary.
`512 <https://github.com/python-attrs/attrs/issues/512>`_,
`513 <https://github.com/python-attrs/attrs/issues/513>`_,
`642 <https://github.com/python-attrs/attrs/issues/642>`_
- Fixed a ``ValueError: Cell is empty`` bug that could happen in some rare edge cases.
`590 <https://github.com/python-attrs/attrs/issues/590>`_
- ``attrs`` can now automatically detect your own implementations and infer ``init=False``, ``repr=False``, ``eq=False``, ``order=False``, and ``hash=False`` if you set ``attr.s(auto_detect=True)``.
``attrs`` will ignore inherited methods.
If the argument implies more than one method (e.g. ``eq=True`` creates both ``__eq__`` and ``__ne__``), it's enough for *one* of them to exist and ``attrs`` will create *neither*.

This feature requires Python 3.
`607 <https://github.com/python-attrs/attrs/issues/607>`_
- Added ``attr.converters.pipe()``.
The feature allows combining multiple conversion callbacks into one by piping the value through all of them, and retuning the last result.

As part of this feature, we had to relax the type information for converter callables.
`618 <https://github.com/python-attrs/attrs/issues/618>`_
- Fixed serialization behavior of non-slots classes with ``cache_hash=True``.
The hash cache will be cleared on operations which make "deep copies" of instances of classes with hash caching,
though the cache will not be cleared with shallow copies like those made by ``copy.copy()``.

Previously, ``copy.deepcopy()`` or serialization and deserialization with ``pickle`` would result in an un-initialized object.

This change also allows the creation of ``cache_hash=True`` classes with a custom ``__setstate__``,
which was previously forbidden (`494 <https://github.com/python-attrs/attrs/issues/494>`_).
`620 <https://github.com/python-attrs/attrs/issues/620>`_
- It is now possible to specify hooks that are called whenever an attribute is set **after** a class has been instantiated.

You can pass ``on_setattr`` both to ``attr.s()`` to set the default for all attributes on a class, and to ``attr.ib()`` to overwrite it for individual attributes.

``attrs`` also comes with a new module ``attr.setters`` that brings helpers that run validators, converters, or allow to freeze a subset of attributes.
`645 <https://github.com/python-attrs/attrs/issues/645>`_,
`660 <https://github.com/python-attrs/attrs/issues/660>`_
- **Provisional** APIs called ``attr.define()``, ``attr.mutable()``, and ``attr.frozen()`` have been added.

They are only available on Python 3.6 and later, and call ``attr.s()`` with different default values.

If nothing comes up, they will become the official way for creating classes in 20.2.0 (see above).

**Please note** that it may take some time until mypy – and other tools that have dedicated support for ``attrs`` – recognize these new APIs.
Please **do not** open issues on our bug tracker, there is nothing we can do about it.
`666 <https://github.com/python-attrs/attrs/issues/666>`_
- We have also provisionally added ``attr.field()`` that supplants ``attr.ib()``.
It also requires at least Python 3.6 and is keyword-only.
Other than that, it only dropped a few arguments, but changed no defaults.

As with ``attr.s()``: ``attr.ib()`` is not going anywhere.
`669 <https://github.com/python-attrs/attrs/issues/669>`_


----

19.3.0

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

Changes
^^^^^^^

- Fixed ``auto_attribs`` usage when default values cannot be compared directly with ``==``, such as ``numpy`` arrays.
`585 <https://github.com/python-attrs/attrs/issues/585>`_


----

19.2.0

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

Backward-incompatible Changes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Removed deprecated ``Attribute`` attribute ``convert`` per scheduled removal on 2019/1.
This planned deprecation is tracked in issue `307 <https://github.com/python-attrs/attrs/issues/307>`_.
`504 <https://github.com/python-attrs/attrs/issues/504>`_
- ``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` do not consider subclasses comparable anymore.

This has been deprecated since 18.2.0 and was raising a ``DeprecationWarning`` for over a year.
`570 <https://github.com/python-attrs/attrs/issues/570>`_


Deprecations
^^^^^^^^^^^^

- The ``cmp`` argument to ``attr.s()`` and ``attr.ib()`` is now deprecated.

Please use ``eq`` to add equality methods (``__eq__`` and ``__ne__``) and ``order`` to add ordering methods (``__lt__``, ``__le__``, ``__gt__``, and ``__ge__``) instead – just like with `dataclasses <https://docs.python.org/3/library/dataclasses.html>`_.

Both are effectively ``True`` by default but it's enough to set ``eq=False`` to disable both at once.
Passing ``eq=False, order=True`` explicitly will raise a ``ValueError`` though.

Since this is arguably a deeper backward-compatibility break, it will have an extended deprecation period until 2021-06-01.
After that day, the ``cmp`` argument will be removed.

``attr.Attribute`` also isn't orderable anymore.
`574 <https://github.com/python-attrs/attrs/issues/574>`_


Changes
^^^^^^^

- Updated ``attr.validators.__all__`` to include new validators added in `425`_.
`517 <https://github.com/python-attrs/attrs/issues/517>`_
- Slotted classes now use a pure Python mechanism to rewrite the ``__class__`` cell when rebuilding the class, so ``super()`` works even on environments where ``ctypes`` is not installed.
`522 <https://github.com/python-attrs/attrs/issues/522>`_
- When collecting attributes using ``attr.s(auto_attribs=True)``, attributes with a default of ``None`` are now deleted too.
`523 <https://github.com/python-attrs/attrs/issues/523>`_,
`556 <https://github.com/python-attrs/attrs/issues/556>`_
- Fixed ``attr.validators.deep_iterable()`` and ``attr.validators.deep_mapping()`` type stubs.
`533 <https://github.com/python-attrs/attrs/issues/533>`_
- ``attr.validators.is_callable()`` validator now raises an exception ``attr.exceptions.NotCallableError``, a subclass of ``TypeError``, informing the received value.
`536 <https://github.com/python-attrs/attrs/issues/536>`_
- ``attr.s(auto_exc=True)`` now generates classes that are hashable by ID, as the documentation always claimed it would.
`543 <https://github.com/python-attrs/attrs/issues/543>`_,
`563 <https://github.com/python-attrs/attrs/issues/563>`_
- Added ``attr.validators.matches_re()`` that checks string attributes whether they match a regular expression.
`552 <https://github.com/python-attrs/attrs/issues/552>`_
- Keyword-only attributes (``kw_only=True``) and attributes that are excluded from the ``attrs``'s ``__init__`` (``init=False``) now can appear before mandatory attributes.
`559 <https://github.com/python-attrs/attrs/issues/559>`_
- The fake filename for generated methods is now more stable.
It won't change when you restart the process.
`560 <https://github.com/python-attrs/attrs/issues/560>`_
- The value passed to ``attr.ib(repr=…)`` can now be either a boolean (as before) or a callable.
That callable must return a string and is then used for formatting the attribute by the generated ``__repr__()`` method.
`568 <https://github.com/python-attrs/attrs/issues/568>`_
- Added ``attr.__version_info__`` that can be used to reliably check the version of ``attrs`` and write forward- and backward-compatible code.
Please check out the `section on deprecated APIs <http://www.attrs.org/en/stable/api.html#deprecated-apis>`_ on how to use it.
`580 <https://github.com/python-attrs/attrs/issues/580>`_

.. _`425`: https://github.com/python-attrs/attrs/issues/425


----

19.1.0

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

Backward-incompatible Changes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Fixed a bug where deserialized objects with ``cache_hash=True`` could have incorrect hash code values.
This change breaks classes with ``cache_hash=True`` when a custom ``__setstate__`` is present.
An exception will be thrown when applying the ``attrs`` annotation to such a class.
This limitation is tracked in issue `494 <https://github.com/python-attrs/attrs/issues/494>`_.
`482 <https://github.com/python-attrs/attrs/issues/482>`_


Changes
^^^^^^^

- Add ``is_callable``, ``deep_iterable``, and ``deep_mapping`` validators.

* ``is_callable``: validates that a value is callable
* ``deep_iterable``: Allows recursion down into an iterable,
 applying another validator to every member in the iterable
 as well as applying an optional validator to the iterable itself.
* ``deep_mapping``: Allows recursion down into the items in a mapping object,
 applying a key validator and a value validator to the key and value in every item.
 Also applies an optional validator to the mapping object itself.

You can find them in the ``attr.validators`` package.
`425`_
- Fixed stub files to prevent errors raised by mypy's ``disallow_any_generics = True`` option.
`443 <https://github.com/python-attrs/attrs/issues/443>`_
- Attributes with ``init=False`` now can follow after ``kw_only=True`` attributes.
`450 <https://github.com/python-attrs/attrs/issues/450>`_
- ``attrs`` now has first class support for defining exception classes.

If you define a class using ``attr.s(auto_exc=True)`` and subclass an exception, the class will behave like a well-behaved exception class including an appropriate ``__str__`` method, and all attributes additionally available in an ``args`` attribute.
`500 <https://github.com/python-attrs/attrs/issues/500>`_
- Clarified documentation for hashing to warn that hashable objects should be deeply immutable (in their usage, even if this is not enforced).
`503 <https://github.com/python-attrs/attrs/issues/503>`_


----

18.2.0

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

Deprecations
^^^^^^^^^^^^

- Comparing subclasses using ``<``, ``>``, ``<=``, and ``>=`` is now deprecated.
The docs always claimed that instances are only compared if the types are identical, so this is a first step to conform to the docs.

Equality operators (``==`` and ``!=``) were always strict in this regard.
`394 <https://github.com/python-attrs/attrs/issues/394>`_


Changes
^^^^^^^

- ``attrs`` now ships its own `PEP 484 <https://www.python.org/dev/peps/pep-0484/>`_ type hints.
Together with `mypy <http://mypy-lang.org>`_'s ``attrs`` plugin, you've got all you need for writing statically typed code in both Python 2 and 3!

At that occasion, we've also added `narrative docs <https://www.attrs.org/en/stable/types.html>`_ about type annotations in ``attrs``.
`238 <https://github.com/python-attrs/attrs/issues/238>`_
- Added *kw_only* arguments to ``attr.ib`` and ``attr.s``, and a corresponding *kw_only* attribute to ``attr.Attribute``.
This change makes it possible to have a generated ``__init__`` with keyword-only arguments on Python 3, relaxing the required ordering of default and non-default valued attributes.
`281 <https://github.com/python-attrs/attrs/issues/281>`_,
`411 <https://github.com/python-attrs/attrs/issues/411>`_
- The test suite now runs with ``hypothesis.HealthCheck.too_slow`` disabled to prevent CI breakage on slower computers.
`364 <https://github.com/python-attrs/attrs/issues/364>`_,
`396 <https://github.com/python-attrs/attrs/issues/396>`_
- ``attr.validators.in_()`` now raises a ``ValueError`` with a useful message even if the options are a string and the value is not a string.
`383 <https://github.com/python-attrs/attrs/issues/383>`_
- ``attr.asdict()`` now properly handles deeply nested lists and dictionaries.
`395 <https://github.com/python-attrs/attrs/issues/395>`_
- Added ``attr.converters.default_if_none()`` that allows to replace ``None`` values in attributes.
For example ``attr.ib(converter=default_if_none(""))`` replaces ``None`` by empty strings.
`400 <https://github.com/python-attrs/attrs/issues/400>`_,
`414 <https://github.com/python-attrs/attrs/issues/414>`_
- Fixed a reference leak where the original class would remain live after being replaced when ``slots=True`` is set.
`407 <https://github.com/python-attrs/attrs/issues/407>`_
- Slotted classes can now be made weakly referenceable by passing ``attr.s(weakref_slot=True)``.
`420 <https://github.com/python-attrs/attrs/issues/420>`_
- Added *cache_hash* option to ``attr.s`` which causes the hash code to be computed once and stored on the object.
`426 <https://github.com/python-attrs/attrs/issues/426>`_
- Attributes can be named ``property`` and ``itemgetter`` now.
`430 <https://github.com/python-attrs/attrs/issues/430>`_
- It is now possible to override a base class' class variable using only class annotations.
`431 <https://github.com/python-attrs/attrs/issues/431>`_


----

18.1.0

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

Changes
^^^^^^^

- ``x=X(); x.cycle = x; repr(x)`` will no longer raise a ``RecursionError``, and will instead show as ``X(x=...)``.

`95 <https://github.com/python-attrs/attrs/issues/95>`_
- ``attr.ib(factory=f)`` is now syntactic sugar for the common case of ``attr.ib(default=attr.Factory(f))``.

`178 <https://github.com/python-attrs/attrs/issues/178>`_,
`356 <https://github.com/python-attrs/attrs/issues/356>`_
- Added ``attr.field_dict()`` to return an ordered dictionary of ``attrs`` attributes for a class, whose keys are the attribute names.

`290 <https://github.com/python-attrs/attrs/issues/290>`_,
`349 <https://github.com/python-attrs/attrs/issues/349>`_
- The order of attributes that are passed into ``attr.make_class()`` or the *these* argument of ``attr.s()`` is now retained if the dictionary is ordered (i.e. ``dict`` on Python 3.6 and later, ``collections.OrderedDict`` otherwise).

Before, the order was always determined by the order in which the attributes have been defined which may not be desirable when creating classes programatically.

`300 <https://github.com/python-attrs/attrs/issues/300>`_,
`339 <https://github.com/python-attrs/attrs/issues/339>`_,
`343 <https://github.com/python-attrs/attrs/issues/343>`_
- In slotted classes, ``__getstate__`` and ``__setstate__`` now ignore the ``__weakref__`` attribute.

`311 <https://github.com/python-attrs/attrs/issues/311>`_,
`326 <https://github.com/python-attrs/attrs/issues/326>`_
- Setting the cell type is now completely best effort.
This fixes ``attrs`` on Jython.

We cannot make any guarantees regarding Jython though, because our test suite cannot run due to dependency incompatabilities.

`321 <https://github.com/python-attrs/attrs/issues/321>`_,
`334 <https://github.com/python-attrs/attrs/issues/334>`_
- If ``attr.s`` is passed a *these* argument, it will no longer attempt to remove attributes with the same name from the class body.

`322 <https://github.com/python-attrs/attrs/issues/322>`_,
`323 <https://github.com/python-attrs/attrs/issues/323>`_
- The hash of ``attr.NOTHING`` is now vegan and faster on 32bit Python builds.

`331 <https://github.com/python-attrs/attrs/issues/331>`_,
`332 <https://github.com/python-attrs/attrs/issues/332>`_
- The overhead of instantiating frozen dict classes is virtually eliminated.
`336 <https://github.com/python-attrs/attrs/issues/336>`_
- Generated ``__init__`` methods now have an ``__annotations__`` attribute derived from the types of the fields.

`363 <https://github.com/python-attrs/attrs/issues/363>`_
- We have restructured the documentation a bit to account for ``attrs``' growth in scope.
Instead of putting everything into the `examples <https://www.attrs.org/en/stable/examples.html>`_ page, we have started to extract narrative chapters.

So far, we've added chapters on `initialization <https://www.attrs.org/en/stable/init.html>`_ and `hashing <https://www.attrs.org/en/stable/hashing.html>`_.

Expect more to come!

`369 <https://github.com/python-attrs/attrs/issues/369>`_,
`370 <https://github.com/python-attrs/attrs/issues/370>`_


----
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