This is the first release in which the C++ code has been moved into a separate package, awkward-cpp . The pure Python awkward package is version-locked to version 1 of awkward-cpp . New features feat: better mask_identity defaults for reducer-like functions. by @jpivarski in https://github.com/scikit-hep/awkward/pull/1873 feat: np.matmul should raise NotImplementedError until it gets implemented by @ioanaif in https://github.com/scikit-hep/awkward/pull/1877 feat: more concise pretty-print. by @jpivarski in https://github.com/scikit-hep/awkward/pull/1861 Bug-fixes and performance fix: ensure that behaviors are propagated through ak.XXX operations by @agoose77 in https://github.com/scikit-hep/awkward/pull/1869 fix: try to fix long long to double by @ianna in https://github.com/scikit-hep/awkward/pull/1860 fix: set appropriate error message for decimal types in arrow by @agoose77 in https://github.com/scikit-hep/awkward/pull/1871 Other wip: run deploy for PR by @agoose77 in https://github.com/scikit-hep/awkward/pull/1891 docs: Fixed typo in ak.argsort page by @Laurits7 in https://github.com/scikit-hep/awkward/pull/1880 docs: add Laurits7 as a contributor for doc by @allcontributors in https://github.com/scikit-hep/awkward/pull/1881 ci: use Python consistently by @agoose77 in https://github.com/scikit-hep/awkward/pull/1892 ci: set tokens & disable release for C++ [skip ci] by @agoose77 in https://github.com/scikit-hep/awkward/pull/1894 ci: simplify hash computation [skip ci] by @agoose77 in https://github.com/scikit-hep/awkward/pull/1897 ci: add option to manually release awkward on PyPI by @agoose77 in https://github.com/scikit-hep/awkward/pull/1898 ci: set constant $SOURCE_DATE_EPOCH by @agoose77 in https://github.com/scikit-hep/awkward/pull/1900 chore: rename is_XXXType to is_XXX (lowercase) by @agoose77 in https://github.com/scikit-hep/awkward/pull/1876 chore: update pre-commit hooks by @pre-commit-ci in https://github.com/scikit-hep/awkward/pull/1878 chore: add README.md to awkward-cpp by @agoose77 in https://github.com/scikit-hep/awkward/pull/1895 New Contributors @Laurits7 made their first contribution in https://github.com/scikit-hep/awkward/pull/1880 Full Changelog : https://github.com/scikit-hep/awkward/compare/v2.0.0rc3...v2.0.0rc4