Add wrappers for zarr v3 #524
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The Zarr v3 specification only lists a few codecs that are officially supported. However, it is desirable to expose the codecs in numcodecs for use with v3 arrays as well. This PR adds wrapper classes for numcodecs support.
The name of the codecs is prefixed with
https://zarr.dev/numcodecs/to avoid naming collisions in case some codecs of numcodecs get added to the Zarr spec. Also, there is a warning that numcodecs codecs are not officially supported and will likely not work in any other Zarr implementation.Most array-to-array ("filters") and bytes-to-bytes codecs are supported. Absent are the variable-length codecs as well as json, msgpack and pickle.
Here is an example of the persisted configuration:
{ "name": "https://zarr.dev/numcodecs/fixedoffsetscale", "configuration": {"offset": 0, "scale": 51, "astype": "uint16"} }Use of numcodecs in v2 arrays is not affected.
Fixes #502