scikit-hep/awkward-1.0: 1.5.0rc1

@matthewfeickert unrestricted the jaxlib version bounds, thanks to a fix that he prompted in JAX: PR #988.

@agoose77 added support for n-dimensional NumpyArrays in ak.where: PR #980. Added axis parameter to ak.fill_none: PR #917. Added np.ravel: PR #985. Fixed ak.from_buffers to support empty buffers: PR #1009. Fixed ak.packed for RegularArrays with size=0: PR #1008. Fixed ak.zip to not convert regular to jagged: #1013. Clarified the documentation of left and right broadcasting: PR #1016. Fixed ak.broadcast_arrays by setting numpy_to_regular=True: PR #1019. Added support for ak.Record in ak.packed: PR #1021. Fixed #1026, jagged slicing of a multidimensional NumpyArray: PR #1029. Added a name parameter to ak.mixin_class: PR #1030.

@henryiii touched up CONTRIBUTING.md: PR #1004. Added a spell-checker in pre-commit that fixed a lot of spelling mistakes in comments and documentation: PR #1003.

@bfis fixed the stack level of the deprecation warning: PR #1058.

@bmwiedemann made the source code reproducible by allowing the build date to be overridden by SOURCE_DATE_EPOCH: PR #1050.

@nsmith- optimized common array slice ("take") operations: PR #1062.

@SantamRC added a better set of kernel unit tests to continuous integration, which will be important for testing GPU kernels: PRs #1065 and #1081.

@jpivarski added a default for NEP-18, so now any NumPy function can be used with Awkward Arrays, as long as the Awkward Array can be cast as NumPy (i.e. is rectilinear): PR #1005. Reverted the ill-conceived #694, SliceVarNewAxis: PR #1028. Made ak.Record iterable (iterates over field names, like dict): PR #1061.

Also, fixed the UnionForm bug described in #770 and #930: PR #991. Fixed #546, ak.fill_none losing the replacement's dtype: PR #995. Fixed two bugs in #992: double-masking of reducers and unmasking of ak.ptp: PR #994. Fixed ak.Array.__dir__ to include methods/properties of overridden classees: PR #993. Fixed #982 by accounting for another kind of "gap" in nonlocal reducers: PR #997. Fixed #998 and #1000, ak.argmax for ListOffsetArray with nonzero start: PR #1001. Fixed ak.fill_none fill value's handling of NumPy dimension: PR #1056. Fixed ak.to_numpy for structured arrays that are also masked arrays: PR #1067.

Continued work on Awkward version 2.x (in the hidden ak._v2 submodule). The following PRs are quick to list, but represent large code additions.

@ioanaif finished __getitem__ for all array types: PRs #959, #1031, #1036, and #1073.

@ianna refactored ArrayBuilder to not depend on C++ that will be removed in v2: PRs #977, #1045, and #1063.

@stormiestsin implemented _localindex in v2: PR #1059. And combinations: PR #1074.

@jpivarski renamed _getitem_array as _carry and made it take an Index: PR #1025. Added VirtualArray: PR #1079.