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The documentation preview is ready to be viewed at http://preview.awkward-array.org.s3-website.us-east-1.amazonaws.com/PR3810

There's still some problems

I found the current logic with prepare and prepare_empty to be fault especially with nested forms. I think implementing a single prepare recursive function that follows the same logic as from_buffers is the right way to go here.

Thanks @ikrommyd, this fixes and allows way more length 0/1 creations from forms than before. This is only needed in 'side-stepping typetracer code' with dak.map_partitions, so could you quickly confirm that this doesn't break any existing tests we have in coffea (and maybe dask-awkward)?

I have ran dask-awkward, uproot, and coffea tests locally with this with no issues. Integration tests CI will test it even better after merging too.

Thanks for checking! 👍