How to use the zarr.convenience.open_array function in zarr

if var_array_info.get('shape') == var_array_info.get('chunks'):
                continue

        # Open array and remove chunks from the data
        var_array = zarr.convenience.open_array(var_path, 'r+')
        if var_array.shape != var_array.chunks:
            # TODO (forman): Fully loading data is inefficient and dangerous for large arrays.
            #                Instead save unchunked to temp and replace existing chunked array dir with temp.
            # Fully load data and attrs so we no longer depend on files
            data = np.array(var_array)
            attributes = var_array.attrs.asdict()
            # Save array data
            zarr.convenience.save_array(var_path, data, chunks=False, fill_value=var_array.fill_value)
            # zarr.convenience.save_array() does not seem save user attributes (file ".zattrs" not written),
            # therefore we must modify attrs explicitly:
            var_array = zarr.convenience.open_array(var_path, 'r+')
            var_array.attrs.update(attributes)