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- update to 23.2.0:
  * The type annotation for `attrs.resolve_types()` is now
    correct.
  * Type stubs now use `typing.dataclass_transform` to decorate
    dataclass-like decorators, instead of the non-standard
    `__dataclass_transform__` special form, which is only
    supported by Pyright.
  * Fixed serialization of namedtuple fields using
    `attrs.asdict/astuple()` with `retain_collection_types=True`.
  * `attrs.AttrsInstance` is now a `typing.Protocol` in both type
    hints and code.
  * This allows you to subclass it along with another `Protocol`.
  * If *attrs* detects that `__attrs_pre_init__` accepts more
    than just `self`, it will call it with the same arguments as
    `__init__` was called.
  * This allows you to, for example, pass arguments to
    `super().__init__()`.
  * Slotted classes now transform `functools.cached_property`
    decorated methods to support equivalent semantics.
  * Added *class_body* argument to `attrs.make_class()` to
    provide additional attributes for newly created classes.
  * It is, for example, now possible to attach methods.
    be deeply immutable
- Initial version

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- remove outdated constructs, we no longer support < 3.8

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- Update to 23.1.0:
  # Backwards-incompatible Changes
  * Python 3.6 has been dropped and packaging switched to static
    package data using Hatch. #993
  # Deprecations
  * The support for zope-interface via the attrs.validators.provides
    validator is now deprecated and will be removed in, or after,
    April 2024.
  * The presence of a C-based package in our developement dependencies
    has caused headaches and we're not under the impression it's used
    a lot.
  * Let us know if you're using it and we might publish it as a
    separate package. #1120
  # Changes
  * attrs.filters.exclude() and attrs.filters.include() now support
    the passing of attribute names as strings. #1068
  * attrs.has() and attrs.fields() now handle generic classes
    correctly. #1079
  * Fix frozen exception classes when raised within e.g.
    contextlib.contextmanager, which mutates their __traceback__
    attributes. #1081
  * @frozen now works with type checkers that implement PEP-681 (ex.
    pyright). #1084
  * Restored ability to unpickle instances pickled before 22.2.0.
    #1085
  * attrs.asdict()'s and attrs.astuple()'s type stubs now accept the
    attrs.AttrsInstance protocol. #1090
  * Fix slots class cellvar updating closure in CPython 3.8+ even when
    __code__ introspection is unavailable. #1092
  * attrs.resolve_types() can now pass include_extras to

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SR for python stack proposal

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- update to 22.2.0:
  * Python 3.5 is not supported anymore.
  * Python 3.6 is now deprecated and support will be removed in the next
    release.
  * `attrs.field()` now supports an *alias* option for explicit `__init__`
    argument names.
  * `attrs.NOTHING` is now an enum value, making it possible to use with
    e.g. `typing.Literal`.
  * Added missing re-import of `attr.AttrsInstance` to the `attrs`
    namespace.
  * Fix slight performance regression in classes with custom `__setattr__`
    and speedup even more.
  * Class-creation performance improvements by switching performance-
    sensitive templating operations to f-strings.

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- python-six is not required for build

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- Update to 22.1.0:
  * Backwards-incompatible Changes
    * Python 2.7 is not supported anymore.
    * Dealing with Python 2.7 tooling has become too difficult for a
      volunteer-run project.
    * We have supported Python 2 more than 2 years after it was officially
      discontinued and feel that we have paid our dues. All version up to 21.4.0
      from December 2021 remain fully functional, of course. #936
    * The deprecated cmp attribute of attrs.Attribute has been removed. This
      does not affect the cmp argument to attr.s that can be used as a shortcut
      to set eq and order at the same time. #939
  * Changes
    * Instantiation of frozen slotted classes is now faster. #898
    * If an eq key is defined, it is also used before hashing the attribute. #909
    * Added attrs.validators.min_len(). #916
    * attrs.validators.deep_iterable()'s member_validator argument now also
      accepts a list of validators and wraps them in an attrs.validators.and_(). #925
    * Added missing type stub re-imports for attrs.converters and attrs.filters. #931
    * Added missing stub for attr(s).cmp_using(). #949
    * attrs.validators._in()'s ValueError is not missing the attribute, expected
      options, and the value it got anymore. #951
    * Python 3.11 is now officially supported. #969

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- update to 21.4.0:
  * Fixed the test suite on PyPy3.8 where ``cloudpickle`` does not work.
  * Fixed ``coverage report`` for projects that use ``attrs`` and don't
    set a ``--source``.
  * When using ``@define``, converters are now run by default when
    setting an attribute on an instance -- additionally to validators.
  * ``import attrs`` has finally landed!
  * ``attr.asdict(retain_collection_types=False)`` (default)
    dumps collection-esque keys as tuples.
  * ``__match_args__`` are now generated to support Python 3.10's
  * If the class-level *on_setattr* is set to ``attrs.setters.validate``
    (default in ``@define`` and ``@mutable``) but no field defines
    a validator, pretend that it's not set.
  * The generated ``__repr__`` is significantly faster on Pythons with
    f-strings.
  * Attributes transformed via ``field_transformer`` are wrapped with
    ``AttrsClass`` again.
  * Generated source code is now cached more efficiently for identical classes.
  * Added ``attrs.converters.to_bool()``.
  * ``attrs.resolve_types()`` now resolves types of subclasses after
    the parents are resolved.
  * Added new validators: ``lt(val)`` (< val), ``le(va)`` (≤ val),
    ``ge(val)`` (≥ val), ``gt(val)`` (> val), and ``maxlen(n)``.
  * ``attrs`` classes are now fully compatible with cloudpickle
  * Added new context manager ``attrs.validators.disabled()`` and
    functions ``attrs.validators.(set|get)_disabled()``.
    They deprecate ``attrs.(set|get)_run_validators()``.
    All functions are interoperable and modify the same internal state.
    They are not – and never were – thread-safe, though.

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- update to 21.2.0:
  * We had to revert the recursive feature for ``attr.evolve()`` because it
    broke some use-cases -- sorry!
  * Python 3.4 is now blocked using packaging metadata because ``attrs`` can't
    be imported on it anymore.
  * The long-awaited, much-talked-about, little-delivered ``import attrs`` is
    finally upon us!
  * 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.
  * Further smaller changes, see included Changelog.md

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- update to 20.3.0:
  - ``attr.define()``, ``attr.frozen()``, ``attr.mutable()``, and ``attr.field()`` remain **provisional**.

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