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Regression in v2.18.0 when setting an item in an object array #1874

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@aplowman

Description

@aplowman

Zarr version

v2.18.0

Numcodecs version

0.12.1

Python Version

3.12

Operating System

Windows

Installation

via poetry install

Description

There seems to be a regression in v2.18.0 (compared to v2.17.2) concerning setting items in an object array.

Steps to reproduce

Setup:

import zarr
from numcodecs import MsgPack
import numpy as np

root = zarr.group()
arr = root.create_dataset(
    name="my_dataset",
    shape=0,
    dtype=object,
    object_codec=MsgPack(),
)
new_items = [
    ["A", 1],
    ["B", 2, "hello"],
]
arr_add = np.empty(len(new_items), dtype=object)
arr_add[:] = new_items
arr.append(arr_add)
arr[:] # --> array([list(['A', 1]), list(['B', 2, 'hello'])], dtype=object)

Problem:

arr[0] = ["C", 3] # raises AttributeError: 'list' object has no attribute 'astype' (from Array._process_for_setitem)

Using Zarr v2.17.2, no such exception is raised, and the first item is successfully modified.

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    bugPotential issues with the zarr-python library

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