`recurse` option for `array_keys` does not work as expected

[miccoli]

Zarr version

v2.17.2

Numcodecs version

v0.12.1 (not relevant?)

Python Version

3.12

Operating System

Mac (not relevant?)

Installation

pip in virtual environment

Description

Not sure if this is a bug or feature, but given a group g the g.array_keys(recurse=True) method appears totally useless to me, if nested groups are present. In fact with the current implementation the returned keys are relative to the subgroups and not to g, so that g[k] does not work as expected.

See #260.

Steps to reproduce

import zarr

gtop = zarr.group()
gnested = gtop.create_group("nested")
gnested.empty("foo", shape=())

print("- array_keys")
for k in gtop.array_keys(recurse=True):
    print(k)

print("- arrays name, value")
for n, v in gtop.arrays(recurse=True):
    print(n, v.name)

The output is

- array_keys
foo
- arrays name, value
foo /nested/foo

I would expect instead

- array_keys
nested/foo
- arrays name, value
nested/foo /nested/foo

so that the returned keys can be used as gtop[k]

Additional output

No response