Reference fsspec store has mismatching asynchron-ity

[juntyr]

Zarr version

3.0.6

Numcodecs version

0.15.1

Python Version

3.13

Operating System

Pyodide

Installation

micropip

Description

When opening a reference fsspec dataset (here produced by the kerchunk-compatible gribscan), the following exception is raised in fsspec:

ValueError: Reference-FS's target filesystem must have same valueof asynchronous

This error can be avoided by manually creating the reference store with asynchronous=False, which then generates the following warning:

UserWarning: fs (<fsspec.implementations.reference.ReferenceFileSystem object at 0x1429bbf0>) was not created with asynchronous=True, this may lead to surprising behavior

Presumably, when zarr creates an fsspec store via the async api, it should ensure that the store is configured with the correct asynchron-ity

Steps to reproduce

import xarray as xr
import gribscan

ds = xr.open_dataset(
    f"reference::https://a3s.fi/compression.lab.climet.eu/hplp_ml_reduced_gg_all_params_levels_1-15_all_steps.grib.ref",
    engine="zarr", consolidated=False,
)
ds

Additional output

No response