Steps to Reproduce

http://zkfiddle.org/sample/2rgqs51/1-instant-spinner-not-updating-in-zk-8-0-4
click the up arrow to increment the value

Actual Result

no onChange event sent to the server

Expected Result

onChange event due to instant = true

Debug Info

works in 8.0.2
works partially in 8.0.3 (only after first click)
stops working in 8.0.4