Return scalar when accessing zero dimensional array

Author: brokkoli71

src/zarr/core/array.py

@@ -1245,6 +1245,8 @@ async def _get_selection(
                 out_buffer,
                 drop_axes=indexer.drop_axes,
             )
+        if indexer.shape == ():
+            return out_buffer.as_numpy_array().item()
         return out_buffer.as_ndarray_like()
 
     async def getitem(

tests/test_array.py

@@ -1262,3 +1262,5 @@ async def test_scalar_array() -> None:
     assert arr[...] == 1.5
     assert arr[()] == 1.5
     assert arr.shape == ()
+    assert isinstance(arr[()], float)
+    assert arr.ndim == 0