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can VLenArray support 2D arrays #199

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@sofroniewn

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@sofroniewn

Right now I think the VLenArray only supports 1-D arrays. What would it take to extend support to 2-D arrays too? I have a list of 2D numpy arrays that I'd like to save as a zarr file using something like

zarr.array( 'foo', foo, dtype='array:f8')

where foo is my list of 2D numpy arrays (they are all NxD where D is fixed across the list but N is variable), but I currently get an error message that ends with

  File "numcodecs/vlen.pyx", line 382, in numcodecs.vlen.VLenArray.encode
ValueError: only 1-dimensional arrays are supported

If this sounds like a bad idea I can think of workarounds where I reshape flatten the arrays ahead of time and then keep track of that D number and reshape them on reading, but I thought I'd ask! Thanks!!

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