revert changes to config.py

Author: normanrz

src/zarr/core/config.py

@@ -1,32 +1,3 @@
-"""
-The config module is responsible for managing the configuration of zarr and is based on the Donfig python library.
-For selecting custom implementations of codecs, pipelines, buffers and ndbuffers, first register the implementations
-in the registry and then select them in the config.
-
-Example:
-    An implementation of the bytes codec in a class ``your.module.NewBytesCodec`` requires the value of ``codecs.bytes``
-    to be ``your.module.NewBytesCodec``. Donfig can be configured programmatically, by environment variables, or from
-    YAML files in standard locations.
-
-    .. code-block:: python
-
-        from your.module import NewBytesCodec
-        from zarr.core.config import register_codec, config
-
-        register_codec("bytes", NewBytesCodec)
-        config.set({"codecs.bytes": "your.module.NewBytesCodec"})
-
-    Instead of setting the value programmatically with ``config.set``, you can also set the value with an environment
-    variable. The environment variable ``ZARR_CODECS__BYTES`` can be set to ``your.module.NewBytesCodec``. The double
-    underscore ``__`` is used to indicate nested access.
-
-    .. code-block:: bash
-
-        export ZARR_CODECS__BYTES="your.module.NewBytesCodec"
-
-For more information, see the Donfig documentation at https://github.com/pytroll/donfig.
-"""
-
 from __future__ import annotations
 
 from typing import Any, Literal, cast
@@ -39,7 +10,7 @@ class BadConfigError(ValueError):
 
 
 class Config(DConfig):  # type: ignore[misc]
-    """The Config will collect configuration from config files and environment variables
+    """Will collect configuration from config files and environment variables
 
     Example environment variables:
     Grabs environment variables of the form "ZARR_FOO__BAR_BAZ=123" and
@@ -57,26 +28,21 @@ def reset(self) -> None:
         self.refresh()
 
 
-# The default configuration for zarr
+# The config module is responsible for managing the configuration of zarr and  is based on the Donfig python library.
+# For selecting custom implementations of codecs, pipelines, buffers and ndbuffers, first register the implementations
+# in the registry and then select them in the config.
+# e.g. an implementation of the bytes codec in a class "NewBytesCodec", requires the value of codecs.bytes.name to be
+# "NewBytesCodec".
+# Donfig can be configured programmatically, by environment variables, or from YAML files in standard locations
+# e.g. export ZARR_CODECS__BYTES__NAME="NewBytesCodec"
+# (for more information see github.com/pytroll/donfig)
+# Default values below point to the standard implementations of zarr-python
 config = Config(
     "zarr",
     defaults=[
         {
             "default_zarr_version": 3,
-            "array": {
-                "order": "C",
-                "write_empty_chunks": False,
-                "v2_default_compressor": {
-                    "numeric": "zstd",
-                    "string": "vlen-utf8",
-                    "bytes": "vlen-bytes",
-                },
-                "v3_default_codecs": {
-                    "numeric": ["bytes", "zstd"],
-                    "string": ["vlen-utf8"],
-                    "bytes": ["vlen-bytes"],
-                },
-            },
+            "array": {"order": "C"},
             "async": {"concurrency": 10, "timeout": None},
             "threading": {"max_workers": None},
             "json_indent": 2,