Add changelog entry. Fix type casting typo.

Author: kgabor

changes/3391.feature.rst

@@ -0,0 +1 @@
+Make config param optional in init_array

src/zarr/testing/utils.py

@@ -46,4 +46,4 @@ def has_cupy() -> bool:
 
 # Decorator for GPU tests
 def gpu_test(func: T) -> T:
-    return cast("T", gpu_mark(skip_if_no_gpu(func)))
+    return cast(T, gpu_mark(skip_if_no_gpu(func)))

tests/test_api.py

@@ -417,7 +417,6 @@ async def test_init_order_warns() -> None:
             store_path=StorePath(store=MemoryStore()),
             shape=(1,),
             dtype="uint8",
-            config=None,
             zarr_format=3,
             order="F",
         )