Merge branch 'main' into pre-commit-ci-update-config

Author: d-v-b

changes/3938.bugfix.md

@@ -2,6 +2,25 @@
 
 <!-- towncrier release notes start -->
 
+## 3.2.1 (2026-05-05)
+
+### Bugfixes
+
+- Fixed a `CastValue` validation bug where the "can we use an out-of-range mode" check
+  inspected the source dtype instead of the target dtype. This meant arrays with a
+  float source dtype and an integer target dtype incorrectly raised a `ValueError`
+  when configured with a `wrap` out-of-range mode. ([#3938](https://github.com/zarr-developers/zarr-python/issues/3938))
+- Fixed a bug where the codec pipeline evolved each codec against the original
+  array spec instead of the spec produced by upstream array-to-array codecs. This
+  caused failures whenever an upstream codec changed the dtype between codec
+  boundaries — e.g. arrays using `CastValue` to convert a single-byte source dtype
+  (`int8`) to a multi-byte target dtype (`int16`) raised a `ValueError` from
+  `BytesCodec` about a missing `endian` configuration. ([#3941](https://github.com/zarr-developers/zarr-python/issues/3941))
+- Fixed breakage in existing fsspec-dependent workflows caused by associating the "memory" URL scheme with
+instances of `ManagedMemoryStore` instead of fsspec's memory-backed store. After this change, store URLs with a "memory" scheme are handled differently when `fsspec` is installed:
+with `fsspec`, a `FsspecStore` backed by a `MemoryFileSystem` is used. Without `fsspec`,
+a `ManagedMemoryStore` is used. ([#3944](https://github.com/zarr-developers/zarr-python/issues/3944))
+
 ## 3.2.0 (2026-04-30)
 
 ### Features

changes/3941.bugfix.md

@@ -369,7 +369,7 @@ async def make_store(
         return await LocalStore.open(root=store_like, mode=mode, read_only=_read_only)
 
     elif isinstance(store_like, str) and parsed is not None:
-        if parsed.scheme == "memory":
+        if parsed.scheme == "memory" and not _has_fsspec:
             # Create or get a ManagedMemoryStore
             return ManagedMemoryStore(name=parsed.name, path=parsed.path, read_only=_read_only)
         elif parsed.scheme == "file" or not parsed.scheme:

docs/release-notes.md

@@ -16,6 +16,7 @@
 from zarr.core.sync import _collect_aiterator, sync
 from zarr.errors import ZarrUserWarning
 from zarr.storage import FsspecStore
+from zarr.storage._common import make_store
 from zarr.storage._fsspec import _make_async
 from zarr.testing.store import StoreTests
 
@@ -544,3 +545,14 @@ async def test_with_read_only_auto_mkdir(tmp_path: Path) -> None:
 
     store_w = FsspecStore.from_url(f"file://{tmp_path}", storage_options={"auto_mkdir": False})
     _ = store_w.with_read_only()
+
+
+@pytest.mark.skipif(
+    parse_version(fsspec.__version__) < parse_version("2024.12.0"),
+    reason="No AsyncFileSystemWrapper",
+)
+async def test_memory_scheme() -> None:
+    """Test that the "memory" scheme creates a `MemoryFileSystem`-backed store"""
+    store = await make_store("memory://test")
+    assert isinstance(store, FsspecStore)
+    assert store.fs.protocol == "memory"