Joe Hamman

@ilan-gold - no progress and I agree its a regression. I think we should support it for v2 arrays but until there is an extension dtype for this in v3,...

Thanks @brokkoli71 for picking this up. What is the expected behavior of `mode='w'`? Should we have a `Store.clear()` method that we call in these cases?

@brokkoli71 - happy to merge this if you can resolve the conflicts.

I've started taking steps to deprecate many of the more exotic stores. See #1756.

@JoOkuma - in v3, the nested directory store layout will be supported through the [`chunk_key_encoding`](https://zarr-specs.readthedocs.io/en/latest/v3/core/v3.0.html#chunk-key-encoding) setting.

@nmoreaud - if you are interested in porting MongoDB support to Zarr-Python 3, you may be interested in checking out the new [Store ABC](https://zarr.readthedocs.io/en/v3/_autoapi/zarr/abc/store/index.html#zarr.abc.store.Store). This should work great with [MongoDB-Motor](https://motor.readthedocs.io/en/stable/)...

@misko - Thanks for piping up! Glad to hear you like zarr and that LMDB store has been serving you well. Zarr had some serious store bloat going on so...

This is feeling like a fairly high priority to start ticking off. For now, I've disabled the mypy checks in pre-commit (#1649) but this should be a short lived state.

closed by https://github.com/zarr-developers/zarr-python/pull/1692 and lots more work by @dstansby. See https://github.com/zarr-developers/zarr-python/issues/1783 for ongoing work on this topic.

@zarr-developers/python-core-devs -- it would be helpful to get some input from folks on the target outcome for v3 here.