examples. The output data type is `octets`, and not `string`.
If the goal is to have the _raw_ `octets` data inserted into a
-`string`, you must use the `%{string:...}` expansion. This expansion
+`string`, you must cast the octets to a string value. That process
will copy the input `octets` value to a the output, changing the data
type to `string`. The value is left alone.
[source,unlang]
----
"User-Name is %{Tmp-Octets-0}"
-"User-Name is %{string:%{Tmp-Octets-0}}"
+"User-Name is %{(string) &Tmp-Octets-0}"
----
if the `&Tmp-Octets-0` attribute has value `0x666f6f` (`foo`)