How to get default serializer?

[JeppeKlitgaard]

I am not sure if this is a bug or intended behaviour, but

zarr-python/src/zarr/core/array.py

Lines 4161 to 4171 in 50b7e01

	serializer : dict[str, JSON] | ArrayBytesCodec or "auto" or "keep", optional
	Array-to-bytes codec to use for encoding the array data.
	Zarr format 3 only. Zarr format 2 arrays use implicit array-to-bytes conversion.
	Following values are supported:
	- dict[str, JSON]: A dict representation of an ``ArrayBytesCodec``.
	- ArrayBytesCodec: An instance of ``ArrayBytesCodec``.
	- "auto": a default serializer will be used. These defaults can be changed by modifying the value of
	``array.v3_default_serializer`` in [`zarr.config`][zarr.config].
	- "keep": Retain the serializer of the input array if it is a zarr Array.

seems to suggest that the default serializer can be modified (and I assumed, wrongly, also obtained) via the zarr.config. (These defaults can be changed by modifying the value of array.v3_default_serializer in [zarr.config][zarr.config].)

However, running:

zarr.config.get("array.v3_default_serializer")

Gives:

KeyError: 'v3_default_serializer'

As an aside:

I am looking into compressibility of some data, and would like to have an uncompressed baseline of my data as a zarr array as well. It seems like the default serializer is BytesCodec, am I correct to assume this is effectively no compression through the serializer? Similarly, the default compressors seem to be (ZstdCodec(),), am I correct that the "no-op" here would just be an empty iterable?