storing arrays with extendable dimensions

[ExpandingMan]

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I was wondering if any consideration has been giving to allow for the storing of arrays with variable dimensions, for example, using HDF5 chunking and the set_dims! function, so that an array in a JLD file could be extended later.

I wanted to use just plain old HDF5 and keep the format really simple for what I want to do, but the aggravation of using strings among other things led me here, where a huge amount of that work has been done already.

Thanks in advance.