refactor: make the input type come first in the generic JSONSerializable protocol.

Author: d-v-b

src/zarr/abc/serializable.py

@@ -4,7 +4,7 @@
 T_contra = TypeVar("T_contra", contravariant=True)
 
 
-class JSONSerializable(Protocol[T_co, T_contra]):
+class JSONSerializable(Protocol[T_contra, T_co]):
     @classmethod
     def from_json(cls, obj: T_contra) -> Self:
         """

src/zarr/core/metadata/v3.py

@@ -333,7 +333,7 @@ class ArrayMetadataJSONLike_V3(TypedDict):
 
 
 @dataclass(frozen=True, kw_only=True)
-class ArrayV3Metadata(Metadata, JSONSerializable[ArrayMetadataJSON_V3, ArrayMetadataJSONLike_V3]):
+class ArrayV3Metadata(Metadata, JSONSerializable[ArrayMetadataJSONLike_V3, ArrayMetadataJSON_V3]):
     shape: tuple[int, ...]
     data_type: ZDType[TBaseDType, TBaseScalar]
     chunk_grid: ChunkGrid