Generalize handling of chunked array types

xarray/core/types.py

@@ -19,7 +19,7 @@
         DaskArray = np.ndarray  # type: ignore
 
     try:
-        from cubed import Spec
+        from cubed import Spec  # type: ignore
     except ImportError:
         Spec = None  # type: ignore
 

xarray/core/variable.py

@@ -1163,9 +1163,12 @@ def chunk(
                 )
 
         elif manager == "cubed":
-            import cubed
+            import cubed  # type: ignore
 
-            chunks = either_dict_or_kwargs(chunks, chunks_kwargs, "chunk")
+            if isinstance(chunks, (float, str, int, tuple, list)):
+                raise TypeError  # unsure if cubed.from_array can handle this directly
+            else:
+                chunks = either_dict_or_kwargs(chunks, chunks_kwargs, "chunk")
 
             if utils.is_dict_like(chunks):
                 chunks = {