Error reading object array

[dstansby]

I'm not 100% sure if this is a valid zarr v2 metadata, but it's erroring with pydantic-zarr:

import tempfile
from pathlib import Path

import pydantic_zarr
import pydantic_zarr.v2
import zarr

zarray = """{
    "chunks": [
        2
    ],
    "compressor": {
        "blocksize": 0,
        "clevel": 5,
        "cname": "lz4",
        "id": "blosc",
        "shuffle": 1
    },
    "dtype": "|O",
    "fill_value": 0,
    "filters": [
        {
            "id": "vlen-utf8"
        }
    ],
    "order": "C",
    "shape": [
        2
    ],
    "zarr_format": 2
}"""
test_dir = Path(tempfile.gettempdir())
with open(test_dir / ".zarray", "w") as f:
    f.write(zarray)

arr = zarr.open(test_dir, mode="r")
pydantic_zarr.v2.ArraySpec.from_zarr(arr)

% python test.py
Traceback (most recent call last):
  File "/Users/dstansby/software/ome-zarr/ome-zarr-models-py/test.py", line 37, in <module>
    pydantic_zarr.v2.ArraySpec.from_zarr(arr)
  File "/Users/dstansby/software/ome-zarr/ome-zarr-models-py/.venv/lib/python3.12/site-packages/pydantic_zarr/v2.py", line 317, in from_zarr
    fill_value=array.dtype.type(array.fill_value).tolist(),
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'int' object has no attribute 'tolist'

[d-v-b]

oops! looks like I never tested with v2 object dtypes. i'm guessing this is a real bug :)