The documentation in earlier releases did not state that the limit of 48K bytes applied to notifications containing binary or string (Binary, String, StringUtf8) data only when data is sent across the network.
For applications running within the server node, the limit for notifications containing binary or string (Binary, String, StringUtf8) data is 2G bytes. Note, however, that this applies only to single user and server applications. In multiuser applications, persistent notifications are sent via the database server, even if the receiving process is on the same node as the sender.
In notification cause events, exception 1267 (Notification info object too big) is raised if the binary or string userInfo data exceeds the applicable value.