AsyncGroup.create_dataset() might call AsyncGroup.create_array() without dtype argument

[DimitriPapadopoulos]

Zarr version

main branch

Description

AsyncGroup.create_array() arguments shape and dtype have no default value, so they are mandatory:

zarr-python/src/zarr/core/group.py

Lines 994 to 1000 in 5ff3fbe

	async def create_array(
	self,
	name: str,
	*,
	shape: ShapeLike,
	dtype: npt.DTypeLike,
	chunks: ChunkCoords | Literal["auto"] = "auto",

As far as I can see, AsyncGroup.create_dataset() may call AsyncGroup.create_array() without dtype argument if kwargs is missing dtype and data is None:

zarr-python/src/zarr/core/group.py

Lines 1158 to 1160 in 5ff3fbe

	if "dtype" not in kwargs and data is not None:
	kwargs["dtype"] = data.dtype
	array = await self.create_array(name, shape=shape, **kwargs)

Granted, that wouldn't make sense, but it would be better to handle that corner case nicely.