Write structure to HDF5 file and read a compound type from HDF5 into Julia structure

How can I save an array of arrays in HDF5? In particular, I’m trying to save an array of Sets, but HDF5 can’t save a Set, so I tried converting to an array, but I still cant save an array of arrays. I’m trying HDF5 over JLD2 because of what I think are similar mapping / serialization issues referenced here

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