Convert NCzarr meta-data to use only Zarr attributes #2936
Merged
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As discussed in a netcdf meeting, convert NCZarr V2 to store all netcdf-4 specific info as attributes. This improves interoperability with other Zarr implementations by no longer using non-standard keys. The price to be paid is that lazy attribute reading cannot be supported.
Other Changes
Addendum
As suggested by Ward, I ensured that this PR supports read backward compatibility with old key format. This addition also adds a test case for this.
Misc. Other Changes