Isn't `version` a `str`?

[DimitriPapadopoulos]

In the following code, the type hint for version is str. Yet, the code has been modified to handle floats too (#189).

Should the type hint be changed from str to str | float?

https://github.com/ome/ome-zarr-py/blob/6a1de2a0924e821fecec7ac3ba8790c0a3ae234f/ome_zarr/format.py#L12-L16