Add numpy_types to vartypes.
@@ -11,4 +11,6 @@ primitive_types = int_types + float_types + bool_types
pandas_types = (pd.Series, pd.DataFrame)
-const_arg_types = (np.ndarray, ) + pandas_types + primitive_types
+numpy_types = (np.ndarray, )
+
+const_arg_types = numpy_types + pandas_types + primitive_types
