Smart decision on dimension_separator
We might want do have a "smart" choice about the dimension_separator
when creating zarr datasets: It's probably a waste of inodes, if we create many folders, each containing only one file (e.g. 2d data with a single spatial chunk may get a folder per timestep containing only a single chunk). So we might want to e.g compute how many files we'd expect per folder and then choose to either use /
or .
.