Pytype

Updates:
* PEP 612:
* Add support for ParamSpecs in source files.
* Basic support for ParamSpec args and kwargs.
* Remove --overriding-return-type-checks (now a no-op).

Bug fixes:
* Fix types of Mapping.keys(), values(), items().
* Don't unnecessarily mutate type parameter values to Any.
* Add missing methods from collections.abc.MutableSequence.

Updates:
* Default --overriding-return-type-checks to True.
* Optimise literal output for class variables as well as constants.
* Do some preliminary work for pytype Python 3.11 support.

Bug fixes:
* Add missing 3.10 attributes to typing.Counter.
* Do not parse default values as types.
* Make `ChainMap` accept `MutableMapping`.

Updates:
* Add a new "missing_modules" parameter to load_pytd.create_loader.
* Support putting pytype settings in a pyproject.toml file.
* Add a performance optimisation for outputting the type of large collections.

Bug fixes:
* Add missing int.bit_count method.
* Improve pytype's handling of dict.update.
* Do better matching of overloads in generic classes.
* Show expected type in InterpreterFunction error messages with *args/**kwargs.
* Allow 'self' as a keyword argument to str.format.

Updates:
* Remove the --overriding-default-value-checks and
--overriding-parameter-name-checks feature flags, which have been no-ops since
the last release.
* Update typeshed pin to commit 78d96cd from July 12.

Updates:
* PEP 612: Add support for imported ParamSpec and Concatenate instances.
* Update typeshed pin to commit 4e0aacc from July 12.
* Feature flags:
* Remove --mapping-is-not-sequence, which has been a no-op since the last
release.
* Default --overriding-default-value-checks to True.
* Default --overriding-parameter-name-checks to True.

Bug fixes:
* Fix a bug in module resolution in load_pytd.
* Don't let one TypeVar contain another, and keep invalid TypeVars when
possible.
* Support calling super() with a subclass of builtins.type.
* Fix annotation of *args and **kwargs when constructing a SimpleFunction.
* Don't report container errors for late types.
* --always-use-return-annotations: handle coroutines.
* Add missing attributes to typing.TextIO.

Updates:
* Default --mapping-is-not-sequence to True.

Bug fixes:
* Fix incorrect "Any" count in pytd printer for Callable[nothing, X].