Enabled string/categorical behavior

[ioanaif]

No description provided.

[codecov]

Codecov Report

Merging #1421 (0592a1c) into main (edfce38) will decrease coverage by 0.48%.
The diff coverage is 42.89%.

Impacted Files	Coverage Δ
src/awkward/_v2/_connect/cuda/__init__.py	0.00% <0.00%> (ø)
src/awkward/_v2/_connect/jax/__init__.py	0.00% <0.00%> (ø)
src/awkward/_v2/contents/content.py	81.91% <0.00%> (-0.13%)	⬇️
src/awkward/_v2/operations/convert/ak_from_cupy.py	50.00% <0.00%> (+23.33%)	⬆️
src/awkward/_v2/operations/convert/ak_from_iter.py	93.75% <ø> (ø)
src/awkward/_v2/operations/convert/ak_from_jax.py	50.00% <0.00%> (-25.00%)	⬇️
src/awkward/_v2/operations/convert/ak_to_cupy.py	33.33% <0.00%> (+23.95%)	⬆️
src/awkward/_v2/operations/convert/ak_to_jax.py	33.33% <0.00%> (-41.67%)	⬇️
src/awkward/_v2/operations/describe/ak_backend.py	10.00% <0.00%> (-2.50%)	⬇️
...wkward/_v2/operations/structure/ak_argcartesian.py	78.94% <ø> (ø)
... and 31 more

[jpivarski]

Great! This should merge well with #1427. I made some of the same changes there (without all of the other tests).

As we agreed on Slack, this doesn't mean that categorical is done, but you have some questions for @ianna about is_unique.