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How to roundtrip to a ZipStore? #3194

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@TomNicholas

In pydata/xarray#10457 and pydata/xarray#10485 we found a few xarray tests which roundtrip to a ZipStore. Previously the store could just be a writable one for both reading and writing, but now that's broken: #3189.

Unlike the other stores supplied in zarr-python, ZipStore does not implement .with_read_only, and IIRC someone said it cannot ever implement that method. But nevertheless I need to be able to write to a ZipStore, and then read back that same data, even if it's not the same python store instance. What's the recommended way to do that?

cc @d-v-b @maxrjones

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