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+Opening or creating an array or group with `mode="w"` or `overwrite=True` no longer deletes the existing node when the call fails. Previously the existing node was deleted before the new one was validated, so an invalid argument (for example `zarr.open(store, mode="w", config=...)`, an invalid `fill_value`, or attributes that are not JSON) destroyed the existing data and created nothing.
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	`1`	+Opening or creating an array or group with `mode="w"` or `overwrite=True` no longer deletes the existing node when the call fails. Previously the existing node was deleted before the new one was validated, so an invalid argument (for example `zarr.open(store, mode="w", config=...)`, an invalid `fill_value`, or attributes that are not JSON) destroyed the existing data and created nothing.