explicitly cast the dtype of where's condition parameter to bool

xarray/core/duck_array_ops.py

@@ -229,9 +229,9 @@
         xp = get_array_namespace(data)
         if xp == np:
             # numpy currently doesn't have a astype:
             return data.astype(dtype, **kwargs)
         return xp.astype(data, dtype, **kwargs)
     return data.astype(dtype, **kwargs)
 
 
 def asarray(data, xp=np, dtype=None):
@@ -373,7 +373,7 @@
 def where(condition, x, y):
     """Three argument where() with better dtype promotion rules."""
     xp = get_array_namespace(condition, x, y)
-    return xp.where(condition, *as_shared_dtype([x, y], xp=xp))
+    return xp.where(xp.astype(condition, xp.bool), *as_shared_dtype([x, y], xp=xp))
 
 
 def where_method(data, cond, other=dtypes.NA):