New features
_(none!)_
Bug-fixes and performance
* fix: EmptyArray.is_numpy should be False. by jpivarski in https://github.com/scikit-hep/awkward/pull/1971
* fix: add return_value='simplified' to ak.transform and revamp ak.firsts/ak.singletons by jpivarski in https://github.com/scikit-hep/awkward/pull/1968
* fix: don't try to support Awkward 1.x pickles. by jpivarski in https://github.com/scikit-hep/awkward/pull/1974
* fix: ak_from_parquet by ioanaif in https://github.com/scikit-hep/awkward/pull/1977
* fix: ak.Record dict constructor should retain type. by jpivarski in https://github.com/scikit-hep/awkward/pull/1981
Other
* refactor: rename `Form` to `form_cls` by agoose77 in https://github.com/scikit-hep/awkward/pull/1976
* refactor: hide Content recursion entry points in `ak._do` submodule. by jpivarski in https://github.com/scikit-hep/awkward/pull/1972
* docs: Jim's documentation touch-ups (API sidebar, obsolete kernels intro) by jpivarski in https://github.com/scikit-hep/awkward/pull/1982
* ci: build(deps): bump pypa/gh-action-pypi-publish from 1.5.1 to 1.6.1 by dependabot in https://github.com/scikit-hep/awkward/pull/1948
* ci: build(deps): bump pypa/cibuildwheel from 2.11.2 to 2.11.3 by dependabot in https://github.com/scikit-hep/awkward/pull/1965
* ci: build(deps): bump pypa/gh-action-pypi-publish from 1.6.1 to 1.6.4 by dependabot in https://github.com/scikit-hep/awkward/pull/1970
* chore: fix RTD configuration by agoose77 in https://github.com/scikit-hep/awkward/pull/1979
**Full Changelog**: https://github.com/scikit-hep/awkward/compare/v2.0.0rc6...v2.0.0rc7