Pytype

Bug fixes:
* Improve the collections_abc overlay.
* Raise an exception for typed dict errors rather than logging them immediately.
* Reset matcher errors between individual parameter matches.
* --overriding-return-type-checks: Allow method return types to be changed when
the overridden type is NoReturn.
* Resolve GenericType nodes better in LookupLocalTypes.

Updates:
* Update typeshed pin to commit 354787f from Apr 8.
* Remove --enable-typed-dicts, which has been a no-op since the last release.
* Add a group of feature flags for checking compatibility of signatures for
overriding methods:
* --overriding-default-value-checks
* --overriding-parameter-count-checks
* --overriding-parameter-name-checks
* --overriding-parameter-type-checks
* --overriding-return-type-checks
* Add code structure for gradual migration to argument-by-argument call
matching.

Bug fixes:
* Move a check out of --enable-nested-classes.
* Fix spurious not-callable error for typing.OrderedDict.

Updates:
* Enable --enable-typed-dicts by default.

Bug fixes:
* Preserve the full name of imported TypedDicts.
* Stop dropping TypedDict annotations from local assignments.
* Don't mark fields of anonymous namedtuple parents as ClassVars.
* Instantiate imported TypedDicts to typed_dict.TypedDict, not Instance.
* Fix more typeshed circular dependency issues.

Updates:
* Add support for `|` for Dicts in 3.9.

Bug fixes:
* Make a collection of bug fixes needed for nested class support.
* Handle attribute accesses on Final[...] constants from pyi files.
* Remove collections.OrderedDict from pytype.
* Remove duplicate NamedTuple class definition from typing.pytd.
* Evaluate late annotations before checking for 'TypeVar not in scope' error.
* Don't print Variable in error messages.
* Represent namedargs as a python dict throughout.

Updates:
* Add basic Python 3.10 support.
* Instantiate pyi namedtuples directly as interpreter classes. This is a large
refactoring that also made namedtuple type-checking more precise, exposing a
fair number of type errors in user code.
* Remove the last traces of the no-longer-necessary --trace-all-classes flag.

Bug fixes:
* Allow __match_args__ in pyi files to be assigned a tuple value.
* Fix a bug in looking up attributes defined via variable annotation.
* Handle Unions better in byte_STORE_ATTR.
* Fix an [unbound-type-param] error.
* Call abstract.Dict.setitem directly when constructing a folded dict literal.

Updates:
* Default --trace-all-classes to True.
* Add a --platform option to pytype.

Bug fixes:
* Fix for comparing recursive tuples for equality.
* Do a better job of determining whether a typing(_extensions) import is
allowed.
* Set TypedDict pyval items when instantiating a TypedDictClass.
* Don't raise duplicate-keyword-argument for positional-only arguments.
* Update definition of typing.get_type_hints.