Awkward

ianna fixed the data type of `ak.argsort` for empty arrays (it should always be integer, but was float in some cases). PR 803.

It fixes code like

python
good_leptons = good_leptons[ak.argsort(good_leptons.pt)]


in which `good_leptons` consists of empty lists.

Exactly the same as 1.2.0rc6.

Fixed a bug from StackOverflow. PR 799.

Fixed an edge case in `ak.cartesian`. PR 794.

Added a mechanism to cast objects `__array_ufunc__` for scikit-hep/vector. PR 796.

Fixed a subtle bug with lazy RecordArray carrying and parameters: PR 789.

Added 'np.nan_to_num' and 'np.isclose' for Vector: PR 790.

reikdas added a parser to read type strings into type objects. Although this has many uses, its motivation is to construct types for TypedArrayBuilder. PRs 668, 773.

ianna added steps toward the development of a TypedArrayBuilder, though it's not done yet. PRs 690, 767, 781.

trickarcher is developing autograd for elementwise operations in JAX. The main issue is to handle slices in the JAX-compiled or JAX-differentiated code block. PRs 765, 779.

henryiii and pre-commit-ci are improving the development environment. PRs 785, 786.

jpivarski has been fixing bugs. PRs 762, 764, 766, 772, 776, 5999fbd, 784. The last of these, 787, is especially important because it prevents Awkward Array from _breaking_ other Numba extensions!