Having Notification.get() makes associating state more desirable, but even in its absence we have requests to store arbitrary state on Notifications object. We could have a mechanism similar to pushState() to store such state.
It's kinda similar to having data-* on elements. My main worry is that we'll end up with many parallel communication channels, but given that the complexity seems relatively low that might not necessarily be bad. -- http://annevankesteren.nl/
