Fix docs, pre-commit, wheel, and coverage CI for the backport branch

- .readthedocs.yaml: bump build image to ubuntu-24.04 (ubuntu-20.04 was
  removed by Read the Docs) and cap docs zarr to <3.1, matching the
  0.15.x compatibility range.
- .pre-commit-config.yaml: pin the mypy hook's zarr to >=3.0.0rc1,<3.1 so
  type checking runs against the zarr 3.0 API that numcodecs.zarr3 targets
  (the unpinned hook pulled zarr 3.2, whose ZDType broke mypy).
- zarr3.py: correct two `# type: ignore[arg-type]` to `[call-overload]`
  for np.dtype(astype) under current numpy.
- wheel.yaml: swap the stalled macos-13 intel runner for macos-15-large,
  matching ci.yaml.
- codecov.yml / pyproject.toml: exclude test files from coverage
  (ignore: tests/** and [tool.coverage.run] omit), matching main.
- test_zarr3.py: cover AsType.evolve_from_array_spec when decode_dtype is
  unset, bringing zarr3.py to 100%.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: mkitti

.github/codecov.yml

@@ -7,6 +7,8 @@ coverage:
     patch:
       default:
         target: 100
+  ignore:
+    - "tests/**"
 comment:
   layout: "diff, files"
   behavior: default

.github/workflows/wheel.yaml

@@ -13,8 +13,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # macos-13 is an intel runner, macos-14 is a arm64 runner
-        os: [ubuntu-latest, windows-latest, macos-13, macos-14]
+        # macos-15-large is an intel runner, macos-14 is an arm64 runner
+        os: [ubuntu-latest, windows-latest, macos-15-large, macos-14]
     env:
       CIBW_TEST_COMMAND: python -c "import numcodecs"
       CIBW_BUILD: "cp311-* cp312-* cp313-*"

.pre-commit-config.yaml

@@ -30,4 +30,4 @@ repos:
       hooks:
       -   id: mypy
           args: [--config-file, pyproject.toml]
-          additional_dependencies: [numpy, pytest, crc32c, zfpy, 'zarr>=3.0.0rc1']
+          additional_dependencies: [numpy, pytest, crc32c, zfpy, 'zarr>=3.0.0rc1,<3.1']

.readthedocs.yaml

@@ -4,12 +4,12 @@ submodules:
   include: all
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-24.04
   tools:
     python: "3.12"
   jobs:
     post_install:
-      - python -m pip install --pre 'zarr>=3.0.0b2'
+      - python -m pip install --pre 'zarr>=3.0.0b2,<3.1'
 
 sphinx:
   configuration: docs/conf.py

numcodecs/tests/test_pyzstd.py

@@ -3,6 +3,7 @@
 import numpy as np
 import pytest
 import pyzstd
+
 from numcodecs.zstd import Zstd
 
 test_data = [

numcodecs/tests/test_zarr3.py

@@ -92,12 +92,14 @@ def test_generic_compressor(
         (numcodecs.zarr3.FixedScaleOffset, {"offset": 0, "scale": 25.5}),
         (numcodecs.zarr3.FixedScaleOffset, {"offset": 0, "scale": 51, "astype": "uint16"}),
         (numcodecs.zarr3.AsType, {"encode_dtype": "float32", "decode_dtype": "float32"}),
+        (numcodecs.zarr3.AsType, {"encode_dtype": "float32"}),
     ],
     ids=[
         "delta",
         "fixedscaleoffset",
         "fixedscaleoffset2",
         "astype",
+        "astype_no_decode_dtype",
     ],
 )
 def test_generic_filter(

numcodecs/zarr3.py

@@ -286,7 +286,7 @@ def __init__(self, **codec_config: dict[str, JSON]) -> None:
 
     def resolve_metadata(self, chunk_spec: ArraySpec) -> ArraySpec:
         if astype := self.codec_config.get("astype"):
-            return replace(chunk_spec, dtype=np.dtype(astype))  # type: ignore[arg-type]
+            return replace(chunk_spec, dtype=np.dtype(astype))  # type: ignore[call-overload]
         return chunk_spec
 
 
@@ -304,7 +304,7 @@ def __init__(self, **codec_config: JSON) -> None:
 
     def resolve_metadata(self, chunk_spec: ArraySpec) -> ArraySpec:
         if astype := self.codec_config.get("astype"):
-            return replace(chunk_spec, dtype=np.dtype(astype))  # type: ignore[arg-type]
+            return replace(chunk_spec, dtype=np.dtype(astype))  # type: ignore[call-overload]
         return chunk_spec
 
     def evolve_from_array_spec(self, array_spec: ArraySpec) -> FixedScaleOffset:

pyproject.toml

@@ -118,6 +118,9 @@ write_to = "numcodecs/version.py"
 skip = "./.git,fixture"
 ignore-words-list = "ba, compiletime, hist, nd, unparseable"
 
+[tool.coverage.run]
+omit = ["tests/*"]
+
 [tool.coverage.report]
 exclude_lines = [
     "pragma: no cover",