This release adds two new features following the release of zarr version 3.0. #25 enables specifying the zarr_format when writing a store if one would prefer to use a different format than the default, and #28 facilitates writing sharded stores through the specification of inner_chunks. Unrelated to zarr version 3.0, #25 also enables specifying the mode during initialization, allowing one to overwrite an existing store without an error.