ObjectStoreRegistry fails with fsspec store

[groutr]

When trying to use fsspec in the object store registry in virtualizarr 2.0, it fails because a function is passed to urlparse instead of a string. I want to use fsspec instead of obstore to make the requests to S3. Looking at the code, it seems like it was anticipated that an fsspec filesystem would be used in the registry because of the checking for the url attribute. Am I misunderstanding something or doing something wrong?

Problematic line (store.url is a method)
https://github.com/zarr-developers/VirtualiZarr/blob/main/virtualizarr/registry.py#L257

Reproducible example:

from virtualizarr.registry import ObjectStoreRegistry
import fsspec

registry = ObjectStoreRegistry()
S3 = fsspec.filesystem('s3')
registry.register("s3://globalnightlight", S3)
registry.resolve("s3://globalnightlight/201204") # Raises an AttributeError

[TomNicholas]

When trying to use fsspec in the object store registry in virtualizarr 2.0

it seems like it was anticipated that an fsspec filesystem would be used in the registry

It was something we briefly discussed, but it's explicitly not supported today (as indicated by the type hints being obstore-specific).

I want to use fsspec instead of obstore to make the requests to S3.

Why? We might be able to generalize this (which will need some thought and work), but our experience is that fsspec causes lots of problems, so it would be good to have a clear reason for doing so.