Not sure if this is for xarray or zarr, but I'll start here. I am using xarray/zarr to save a dataset that includes a Dask array with dtype='bytes', binary compressed image data. I have lots of ...

I'm confused about how to preset min_itemsizes for appending to an HDFStore. Say DataFrame a and b in the MWE below is user-provided, so it can contain any character and the encoding is unknown.