remove off-target changes

Author: d-v-b

src/zarr/core/array_spec.py

@@ -63,7 +63,7 @@ def from_dict(cls, data: ArrayConfigParams) -> Self:
         """
         kwargs_out: ArrayConfigParams = {}
         for f in fields(ArrayConfig):
-            field_name = cast(Literal["order", "write_empty_chunks"], f.name)
+            field_name = cast("Literal['order', 'write_empty_chunks']", f.name)
             if field_name not in data:
                 kwargs_out[field_name] = zarr_config.get(f"array.{field_name}")
             else:

src/zarr/core/buffer/core.py

@@ -475,7 +475,7 @@ def as_scalar(self) -> ScalarType:
         """Returns the buffer as a scalar value"""
         if self._data.size != 1:
             raise ValueError("Buffer does not contain a single scalar value")
-        return cast(ScalarType, self.as_numpy_array()[()])
+        return cast("ScalarType", self.as_numpy_array()[()])
 
     @property
     def dtype(self) -> np.dtype[Any]:

src/zarr/core/chunk_grids.py

@@ -63,7 +63,10 @@ def _guess_chunks(
     """
     if isinstance(shape, int):
         shape = (shape,)
-    typesize = max(typesize, 1)
+
+    if typesize == 0:
+        return shape
+
     ndims = len(shape)
     # require chunks to have non-zero length for all dimensions
     chunks = np.maximum(np.array(shape, dtype="=f8"), 1)