add dtype to ScalarWrapper

Author: brokkoli71

src/zarr/core/array.py

@@ -1244,7 +1244,7 @@ async def _get_selection(
                 out_buffer,
                 drop_axes=indexer.drop_axes,
             )
-        if indexer.shape == ():
+        if isinstance(indexer, BasicIndexer) and indexer.shape == ():
             return out_buffer.as_scalar()
         return out_buffer.as_ndarray_like()
 

src/zarr/core/buffer/core.py

@@ -106,12 +106,13 @@ def __eq__(self, other: object) -> Self:  # type: ignore[explicit-override, over
 
 
 class ScalarWrapper:
-    def __init__(self, value: Any) -> None:
+    def __init__(self, value: Any, dtype: npt.DTypeLike | None = None) -> None:
         self._value: Any = value
+        self._dtype: npt.DTypeLike = dtype or np.dtype(type(self._value))
 
     @property
     def dtype(self) -> np.dtype[Any]:
-        return np.dtype(type(self._value))
+        return self._dtype
 
     @property
     def ndim(self) -> int: