Zarr version

3.0.0a0

Numcodecs version

0.12.1

Python Version

3.10.12

Operating System

Linux

Installation

pip install zarr==3.0.0a0

Description

This is a downstream issue for Kerchunk.

In ZarrV2,BaseStore inherited fromMutableMapping which brought with it the ability tocopy() and callitems() on aBaseStore, which Kerchunk depended onhere.

In ZarrV3, neitherStorePath norStore arecopy()-able, and of course__iter__,__setitem__, and__getitem__ are not available to make it anything like aMutableMapping.

@martindurant do you think this is something Kerchunk should handle or should ZarrV3 preserve the behavior of stores?

Steps to reproduce

This is the definition of the function Kerchunk is calling:

fromzarr.store.coreimportMemoryStore,StorePathdef_encode_for_JSON(store):"""Make store JSON encodable"""fork,vinstore.copy().items():ifisinstance(v,list):continueelse:try:# minify JSONv=ujson.dumps(ujson.loads(v))except (ValueError,TypeError):passtry:store[k]=v.decode()ifisinstance(v,bytes)elsevexceptUnicodeDecodeError:store[k]="base64:"+base64.b64encode(v).decode()returnstore_encode_for_JSON(StorePath(MemoryStore(mode="w")))# Will throw

Additional output

No response