Fix `embed_storage` on features inside lists/sequences
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2022-07-01T11:58:43Z
https://github.com/huggingface/datasets/pull/4615#issuecomment-1172268521
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2022-07-08T12:13:10Z
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Add a dedicated function for embed_storage to always preserve the embedded/casted arrays (and to have more control over `embed_storage` in general).

Fix #4591 

~~(Waiting for #4608 to be merged to mark this PR as ready for review - required for fixing `xgetsize` in private repos)~~ Done!