Events that scale
In an app on the Heisenware platform, a counter registered its event handler again once a minute. Nothing in between knew it was the same listener. After 19 hours the instance held 1,100 copies of one handler, and every pulse of the counter went out 1,100 times.
VRPC 3.15 ends that for good. It brings protocol 4, and with it a simple rule: an event function runs once, however many listen.